| In millions, except per share items | Sep-30-19 | Jun-30-19 | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Operating activities | | | | | | | | |
| Net (loss) income | -22.5 | -8.0 | -2.4 | 7.6 | 5.2 | 1.0 | 0.3 | -4.0 |
| |
| Adjustments to reconcile net (loss) income to net cash from operating activities: | | | | | | | | |
| Depreciation and amortization | 69.8 | 58.2 | 46.9 | 41.8 | 35.3 | 29.1 | 22.9 | 21.7 |
| Amortization of right-of-use assets | 5.8 | 3.6 | 1.3 | | | | | |
| Amortization of deferred costs | 2.9 | 2.6 | 2.4 | 2.2 | 1.5 | 0.9 | 0.4 | |
| Gain on disposal of equipment | -0.1 | -0.1 | -0.3 | -0.2 | -0.3 | -0.1 | -0.8 | -0.9 |
| Impairment of intangible assets | 6.0 | | | | | | | |
| Impairment of other long-lived assets | 0.1 | | | | | | 1.6 | |
| Stock-based compensation expense | 19.2 | 18.8 | 18.1 | 17.6 | 17.0 | 15.3 | 13.7 | 12.7 |
| Benefit for deferred income taxes | -15.5 | -12.5 | -6.3 | -16.6 | -16.6 | -16.7 | -18.2 | -15.4 |
| Non-cash interest expense related to amortization of debt discount | 7.9 | 7.2 | 6.5 | 6.3 | 6.2 | 6.1 | 6.0 | 4.4 |
| Other non-cash items, net | -0.9 | -0.5 | -0.2 | -0.1 | 0.0 | -0.2 | -0.1 | -0.5 |
| Changes in assets and liabilities: | | | | | | | | |
| Accounts receivable | 7.6 | 3.8 | -1.7 | -6.0 | -5.7 | -4.6 | -4.0 | 1.8 |
| Prepaid expenses and other current assets | -2.4 | -2.6 | -9.2 | -3.7 | -2.8 | -1.1 | 0.7 | 0.3 |
| Other assets | -2.7 | -3.0 | -2.9 | -5.2 | -5.0 | -4.2 | -1.9 | -0.6 |
| Accounts payable | 3.1 | 1.1 | -4.0 | -7.4 | -1.1 | 0.5 | -2.5 | 5.0 |
| Accrued expenses and other current liabilities | 0.6 | -3.2 | 10.0 | 5.6 | 4.5 | 3.9 | 2.7 | -1.0 |
| Other long-term liabilities | -9.3 | -7.1 | -1.9 | -0.2 | 0.0 | 0.0 | 0.4 | 0.1 |
| Deferred revenue | 18.6 | 17.3 | 12.9 | 11.3 | 8.4 | 5.7 | 5.2 | 6.2 |
| Net cash provided by operating activities | 88.1 | 75.8 | 69.0 | 53.6 | 47.7 | 37.6 | 26.9 | 31.2 |
| |
| Investing activities | | | | | | | | |
| Purchases of property and equipment | -12.7 | -11.4 | -12.6 | -13.1 | -15.3 | -15.1 | -14.1 | -17.4 |
| Proceeds from sale of property and equipment and businesses | 0.3 | 0.4 | 0.6 | 0.9 | 0.7 | 0.9 | 1.3 | 1.3 |
| Proceeds from maturities of derivatives | 1.8 | 2.3 | 2.6 | | 2.6 | 1.7 | | |
| Purchases of derivatives | | | 1.4 | 0.0 | | | -1.4 | 0.0 |
| Payment for intangibles | | | | | -7.0 | | -2.5 | -1.3 |
| Payment for acquisition, net of cash acquired | -621.7 | -622.0 | -489.6 | | | -154.2 | -154.7 | |
| Net cash used in investing activities | -630.9 | -633.8 | -502.2 | -160.0 | -165.1 | -173.0 | -175.8 | -91.7 |
| |
| Financing activities | | | | | | | | |
| Proceeds from exercise of stock options | 3.4 | 3.5 | 3.3 | 3.8 | 4.2 | 4.9 | 4.3 | 6.0 |
| Proceeds from issuance of common stock for secondary offering | | | | 199.3 | 199.3 | | | |
| Proceeds from issuance of treasury stock under employee stock purchase plan | 3.4 | 3.5 | 3.3 | 3.8 | 4.2 | 4.9 | 4.3 | 6.0 |
| Payments of withholding taxes in connection with restricted stock unit vesting | | -2.6 | -3.1 | -2.9 | -2.7 | -2.2 | -3.1 | -2.1 |
| Proceeds from long-term borrowings, net of debt issuance costs | 529.0 | 529.5 | 531.0 | | | 88.1 | 227.7 | |
| Payments on long-term borrowings | 25.0 | -45.0 | | 0.0 | -50.8 | 29.2 | | 0.0 |
| Net cash provided by financing activities | 444.3 | 573.2 | 618.9 | 176.8 | 198.9 | 80.7 | 175.8 | 127.6 |
| Effect of currency exchange rate changes on cash | -1.4 | -0.3 | -1.5 | -0.5 | 0.1 | 0.6 | 2.3 | 1.8 |
| Net (decrease) increase in cash, cash equivalents and restricted cash | -97.1 | | | | 72.8 | | | |
| |
| Supplemental disclosure of cash flow information | | | | | | | | |
| Cash paid for income taxes, net | 3.6 | 0.6 | 0.4 | 0.5 | 0.2 | 0.7 | 0.7 | 0.8 |
| Cash paid for interest | 15.1 | 12.6 | | 4.8 | 3.0 | 2.6 | | |
| |
| Supplemental disclosure of non-cash investing and financing activities: | | | | | | | | |
| Capitalization of stock-based compensation | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.3 | 0.2 |
| Acquisition of property and equipment included in accounts payable and accrued expenses | -0.2 | 1.0 | -2.9 | -0.1 | -2.9 | 0.4 | 2.4 | -0.6 |