| In millions, except per share items | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Net income | 66.0 | 35.2 | 20.6 | 43.3 | 70.1 | 41.1 | 5.8 | -72.4 |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Depreciation, accretion, and amortization of intangible assets | 123.8 | 111.4 | 95.8 | 83.2 | 65.9 | 58.2 | 58.3 | |
| Amortization of deferred financing costs and note discount | 11.4 | 13.0 | 1.9 | 0.9 | 1.0 | 9.3 | 2.4 | |
| Stock-based compensation expense | 19.5 | 16.5 | 12.3 | 11.1 | 9.3 | 6.0 | 4.6 | 3.5 |
| Deferred income taxes | 11.0 | 3.0 | 8.5 | 25.7 | -14.9 | -18.7 | 3.7 | 0.7 |
| Loss (gain) on disposal of assets | -14.0 | 3.2 | 2.8 | 1.8 | 1.0 | | | 5.8 |
| Other reserves and non-cash items | 3.1 | 5.2 | 4.8 | 1.8 | -0.8 | 0.9 | -4.5 | |
| Changes in assets and liabilities: | | | | | | | | |
| (Increase) decrease in accounts and notes receivable, net | 17.4 | -12.2 | -11.1 | -3.6 | -17.7 | 7.1 | -2.4 | -3.5 |
| (Increase) decrease in prepaid, deferred costs, and other current assets | -19.6 | -7.6 | 15.5 | -18.9 | -0.6 | -2.2 | 7.3 | |
| Decrease (increase) in inventory | -4.7 | -2.4 | -1.9 | -2.4 | -2.3 | | -1.1 | -1.1 |
| Decrease (increase) in other assets | 8.4 | -4.2 | -1.5 | 18.5 | -17.9 | 2.1 | 1.7 | 1.1 |
| Decrease in accounts payable | -8.0 | -4.9 | 12.8 | -12.4 | 4.6 | 6.4 | -3.9 | -5.3 |
| Decrease in accrued liabilities | 31.9 | 20.1 | 29.7 | -6.2 | 19.8 | -9.8 | 0.2 | -4.9 |
| Decrease in other liabilities | 10.4 | 3.1 | -6.8 | -6.3 | -4.2 | -5.7 | -4.6 | |
| Net cash provided by operating activities | 256.6 | 188.6 | 183.6 | 136.4 | 113.3 | 105.2 | 74.9 | |
| |
| Cash flows from investing activities: | | | | | | | | |
| Additions to property and equipment | -138.3 | -108.0 | -71.6 | -89.6 | -64.4 | -48.1 | -25.8 | |
| Acquisitions, net of cash acquired | -103.9 | -227.0 | -189.6 | -21.0 | -167.6 | | | -0.4 |
| Proceeds from sale of assets and businesses | 36.7 | | | | | | | |
| Net cash used in investing activities | -209.6 | -336.9 | -266.7 | -113.8 | -234.5 | -50.7 | -26.0 | |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from borrowings under revolving credit facility | 452.7 | 127.7 | 311.3 | 245.1 | | | | |
| Repayments of borrowings under revolving credit facility | -499.6 | -61.5 | -397.7 | -261.6 | | | | |
| Proceeds from exercises of stock options | 1.1 | 0.8 | 2.6 | 7.3 | 11.4 | 7.4 | 1.6 | 0.4 |
| Repurchase of capital stock | -4.7 | -7.2 | -32.4 | -4.8 | -3.2 | -1.7 | -0.5 | |
| Net cash used in financing activities | -48.5 | 99.2 | 155.0 | -14.1 | 123.5 | -62.2 | -42.2 | |
| |
| Effect of exchange rate changes on cash | -4.0 | -6.0 | 1.3 | -0.3 | 0.0 | 0.4 | 0.4 | -0.3 |
| Net decrease in cash and cash equivalents | -5.6 | -55.1 | 73.1 | 8.3 | 2.4 | -7.3 | 7.0 | -10.0 |
| |
| Cash and cash equivalents as of beginning of period | | | | | | | | |
| Cash and cash equivalents as of end of period | | | | | | | | |
| Supplemental disclosure of cash flow information: | | | | | | | | |
| Cash paid for interest | 19.5 | 21.1 | 20.8 | 21.3 | 20.4 | 29.8 | 30.5 | |
| Cash paid for income taxes | 28.3 | 26.0 | 4.0 | 3.0 | 1.8 | 0.8 | 0.3 | 0.2 |