For the fourth quarter and full year 2014, we had three customers that individually represented more than 10% of total revenue (fourth quarter and full year 2013 — three customers and two customers, respectively).

4. ACCOUNTS RECEIVABLE

In November 2012, we renewed and amended our accounts receivable sales agreement to sell up to $375.0 at any one time in accounts receivable on an uncommitted basis (subject to pre-determined limits by customer) to two third-party banks. This agreement is renewable annually by mutual consent and can be terminated at any time by the banks or by us. In November 2013, we renewed and amended the agreement to reduce its overall capacity to $250.0 based upon our annual review of our requirements under this agreement. In November 2014, we renewed and amended this agreement at the same capacity and added a third bank. Each of these banks had a Standard and Poor's long-term rating of A or above and short-term rating of A-1 at December 31, 2014. At December 31, 2014, we had sold $50.0 of accounts receivable under this facility (December 31, 2013 — $50.0). The accounts receivable sold are removed from our consolidated balance sheet and reflected as cash provided by operating activities in our consolidated statement of cash flows. Upon sale, we assign the rights to the accounts receivable to the banks. We continue to collect cash from our customers and remit the cash to the banks when collected. We pay interest and fees which we record in finance costs in our consolidated statement of operations.

5. INVENTORIES

We record our inventory provisions and valuation recoveries in cost of sales. We record inventory provisions to reflect write-downs in the value of our inventory to net realizable value, and valuation recoveries primarily to reflect realized gains on the disposition of inventory previously written down to net realizable value. We recorded net inventory provisions of $0.3 and $5.8 for the fourth quarter and full year 2014, respectively (fourth quarter of 2013 — net inventory recoveries of $0.3; full year 2013 — net inventory provisions of $7.9). We regularly review our estimates and assumptions used to value our inventory through analysis of historical performance.

6. CREDIT FACILITIES

Our $400.0 revolving credit facility was scheduled to mature in January 2015. This facility included an accordion feature that would have allowed us to increase the credit limit under this facility by an additional $50.0 upon satisfaction of certain terms and conditions. In October 2014, we amended this facility under generally similar terms and conditions, extending its maturity to October 2018. Based on a review of our overall requirements, the credit limit of the amended facility was reduced to $300.0, with an accordion feature that allows us to increase this limit by an additional $150.0 upon satisfaction of certain terms and conditions. The facility includes a $25.0 swing line, subject to the overall credit limit, that provides for short-term borrowings up to a maximum of seven days. Borrowings under this facility bear interest for the period of the draw at LIBOR, Prime or Federal Funds rate plus a margin. The credit facility permits us and certain designated subsidiaries to borrow funds for general corporate purposes (including acquisitions). We are required to comply with certain restrictive covenants in respect of the facility, including those relating to the incurrence of senior ranking indebtedness, the sale of assets, a change of control, and certain financial covenants related to indebtedness and interest coverage. Certain of our assets are pledged as security for borrowings under this facility.

Borrowings under our revolving credit facility have historically been outstanding for fewer than 90 days. In December 2012, we completed a substantial issuer bid to repurchase for cancellation $175.0 of our subordinate voting shares, $55.0 of which were funded through this facility, which we repaid in the first half of 2013. At December 31, 2014, there were no amounts outstanding under this facility (December 31, 2013 — no amounts outstanding), and we were in compliance with all applicable restrictive and financial covenants required by this facility. Commitment fees paid in the fourth quarter and full year 2014 were $0.5 and $2.0, respectively (fourth quarter and full year 2013 — $0.5 and $2.0, respectively). At December 31, 2014, we had $30.1 (December 31, 2013 — $29.7) outstanding in letters of credit under this facility. 

We also have a total of $70.0 of uncommitted bank overdraft facilities available for intraday and overnight operating requirements. There were no amounts outstanding under these overdraft facilities at December 31, 2014 or December 31, 2013.

The amounts we borrow and repay under these facilities can vary significantly from month-to-month depending upon our working capital and other cash requirements.

7. CAPITAL STOCK

We have repurchased subordinate voting shares in the open market for cancellation in recent years pursuant to normal course issuer bids (NCIBs), which allow us to repurchase a limited number of subordinate voting shares during a specified period, and a substantial issuer bid (SIB). As part of the NCIB process, we have entered into Automatic Share Purchase Plans (ASPPs) with brokers, that allow such brokers to purchase our subordinate voting shares in the open market on our behalf for cancellation under our NCIBs (including during any applicable trading blackout periods). In addition, we have entered into program share repurchases (PSRs) as part of the NCIB process, pursuant to which we make a prepayment to a broker in consideration for the right to receive a variable number of subordinate voting shares upon such PSR's completion. Under such PSRs, the price and number of subordinate voting shares to be repurchased by us is determined based on a discount to the volume weighted-average market price of our subordinate voting shares during the term of the PSR, subject to certain terms and conditions. The subordinate voting shares repurchased under any PSR are cancelled upon completion of each PSR under the NCIB.

In August 2014, we completed an NCIB launched in August 2013 (the 2013 NCIB), which allowed us to repurchase, at our discretion, up to approximately 9.8 million subordinate voting shares in the open market, or as otherwise permitted. During 2014, we paid $59.6 (including transaction fees) to repurchase and cancel an aggregate of 5.5 million subordinate voting shares at a weighted average price of $10.82 per share under the 2013 NCIB, including 4.0 million subordinate voting shares repurchased pursuant to two PSRs and 0.9 million subordinate voting shares repurchased pursuant to an ASPP completed during the term of the 2013 NCIB. The maximum number of subordinate voting shares we were permitted to repurchase for cancellation under the 2013 NCIB was reduced by 0.3 million subordinate voting shares we purchased in the open market during its term to satisfy obligations under our stock-based compensation plans.

On September 9, 2014, the TSX accepted our notice to launch a new NCIB (the 2014 NCIB), which allows us to repurchase, at our discretion, until the earlier of September 10, 2015 or the completion of purchases thereunder, up to approximately 10.3 million subordinate voting shares (representing approximately 5.8% of our total outstanding subordinate voting and multiple voting shares at the time of launch) in the open market or as otherwise permitted, subject to the normal terms and limitations of such bids. During 2014, we paid $31.0 (including transaction fees) to repurchase and cancel 2.9 million subordinate voting shares under the 2014 NCIB at a weighted average price of $10.53 per share. In December 2014, the TSX accepted our notice to amend the 2014 NCIB to permit the repurchase of our subordinate voting shares thereunder through one or more PSRs. In connection therewith, we paid $50.0 to a broker in December 2014 under a PSR for the right to receive a variable number of our subordinate voting shares upon such PSR's completion, which is expected by mid-March 2015 .