| In millions, except per share items | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K |
| Cash flows from operating activities | | | | |
| Net income (loss) | -24.4 | -123.0 | -98.4 | -90.5 |
| |
| Adjustments to reconcile net income (loss) to net cash from operating activities: | | | | |
| Depreciation and amortization | 133.8 | 139.5 | 127.0 | 104.0 |
| Non-cash interest charges and amortization of debt discount and deferred financing costs | 17.5 | 65.6 | 47.5 | 9.9 |
| Equity-based compensation expense | 5.3 | 4.1 | 5.3 | 5.3 |
| Provision for doubtful accounts | 4.4 | 3.5 | 2.6 | 1.4 |
| Deferred income taxes | -0.1 | -23.3 | -69.1 | -14.6 |
| Unrealized foreign currency gains | -13.5 | 5.0 | -4.4 | 10.4 |
| Gain on sale of business | | -1.8 | | -4.7 |
| Payment of contingent consideration | -2.9 | | | |
| Other | 5.4 | -0.2 | -0.2 | 0.1 |
| Changes in operating assets and liabilities, net of effects of acquisitions and disposal: | | | | |
| Accounts receivable | -7.8 | -6.3 | -1.5 | 4.6 |
| Prepaid expenses and other current assets | 1.7 | 1.6 | 4.2 | 3.7 |
| Other assets | 0.7 | 0.7 | 4.4 | 4.8 |
| Accounts payable | 0.7 | -3.8 | -0.8 | -1.6 |
| Accrued compensation and benefits | 3.5 | -6.2 | 8.2 | -3.9 |
| Other accrued expenses | -3.5 | 4.1 | -1.6 | -3.5 |
| Net cash provided by operating activities | 127.1 | 68.8 | 17.4 | 22.4 |
| |
| Cash flows from investing activities | | | | |
| Purchases of property and equipment | -14.6 | -10.7 | -7.4 | -5.2 |
| Software development costs | -19.8 | -15.0 | -11.7 | -11.3 |
| Acquisitions of businesses, net of cash and restricted cash acquired of $6,068 and $2,711 | -66.5 | -78.5 | -804.2 | -4.5 |
| Proceeds from disposal of business | | 23.7 | 4.0 | 2.1 |
| Other | 0.0 | 0.6 | -0.1 | |
| Net cash used in investing activities | -100.9 | -80.0 | -819.4 | -10.7 |
| |
| Cash flows from financing activities | | | | |
| Proceeds from revolving credit facility | | 5.0 | 33.5 | 33.4 |
| Repayment of revolving credit facility | | -38.5 | | |
| Proceeds from term credit facility, net of debt discount of $1,013 | | 1,350.3 | 1,364.1 | |
| Repayments of term credit facility | -63.3 | -1,497.8 | -724.9 | -39.3 |
| Payments of deferred financing costs | -0.9 | | | |
| Net cash provided by (used in) financing activities | -67.0 | 121.9 | 808.4 | -8.6 |
| |
| Cash, cash equivalents, and restricted cash | | | | |
| |
| Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets | | | | |
| Cash and cash equivalents | | | | |
| Restricted cash, included in prepaid expenses and other current assets | | | | |
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| Supplemental disclosure of cash flows information | | | | |