| In millions, except per share items | Dec-31-20 | Sep-30-20 | Jun-05-20 | Mar-31-20 | Dec-31-19 | Sep-30-19 | Jun-30-19 | Jun-05-19 |
| | 10-K | 10-Q | 8-K | 10-Q | 10-K | 10-Q | 10-Q | 8-K |
| Cash flows from operating activities: | | | | | | | | |
| Net income | 51.3 | 91.3 | | 40.7 | 74.8 | 83.0 | 41.1 | |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Depreciation and amortization expense | 33.6 | 33.3 | | 32.3 | 29.4 | 29.3 | 28.6 | |
| Amortization of debt issuance costs and discount | 0.4 | 0.4 | | 0.4 | 0.5 | 0.5 | 0.5 | |
| Amortization of terminated interest rate swaps | | 4.6 | | 1.6 | 1.6 | 1.7 | 1.7 | |
| Stock-based compensation expense | 18.8 | 19.3 | | 15.4 | 15.4 | 11.2 | 9.9 | |
| Unrealized foreign currency losses (gains) | 13.4 | 17.4 | | -4.8 | 1.3 | -8.2 | 8.4 | |
| Loss on modification or extinguishment of debt | | | | | | | | |
| Change in fair value of acquisition-related contingent consideration | | -44.5 | | 0.6 | | | | |
| Equity in income of unconsolidated joint ventures | | | | | | | | |
| Deferred income taxes | 11.8 | -0.6 | | -18.5 | 1.5 | -2.9 | -11.9 | |
| Other reconciling items | 0.7 | 8.2 | | 0.1 | -0.2 | 0.3 | 0.5 | |
| Changes in operating assets and liabilities, net of acquired assets and assumed liabilities: | | | | | | | | |
| Accounts receivable and unbilled services | -172.2 | | | | -89.3 | | | |
| Prepaid expenses and other assets | -6.4 | | | | -13.7 | | | |
| Accounts payable and other liabilities | | | | | | | | |
| Income taxes | -0.1 | | | | -31.0 | | | |
| Payment of acquisition-related contingent consideration | | | | | | -83.2 | | |
| Net cash provided by operating activities | 160.1 | 180.6 | | 60.6 | 187.6 | 70.8 | -45.8 | |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchase of fixed assets | -12.8 | -54.0 | | -21.5 | -13.1 | -20.3 | -21.0 | |
| Proceeds from the sale of fixed assets | 0.0 | 0.0 | | 0.0 | | | 0.0 | |
| Cash (paid) received for interest on interest rate swap | -1.9 | -6.4 | | -0.8 | -0.4 | 0.2 | 0.4 | |
| Return of joint venture capital contribution | | | | | | | | |
| Cash received from the sale of marketable securities | | | | | | | | |
| Acquisition of Care Innovations, Inc., net of cash acquired | | | | -159.1 | | | | |
| Net cash used in investing activities | -14.7 | -18.4 | | -181.3 | -13.5 | -20.1 | -20.5 | |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from issuance of long-term debt | | | | | 1,000.0 | 300.0 | | |
| Repayment of long-term debt | -25.0 | | | | -1,216.5 | | | |
| Repayment on accounts receivable financing agreement | | | | | -30.0 | | | |
| Borrowings on line of credit | | 100.0 | | 100.0 | 193.8 | | 40.0 | |
| Repayments of line of credit | -42.5 | -55.0 | | -55.0 | -105.0 | | -40.0 | |
| Payment for debt issuance costs | -0.5 | -0.5 | | -0.5 | -4.5 | | | |
| Acquisition of noncontrolling interest | | | | | | -4.1 | | |
| Proceeds from stock issued under employee stock purchase plan and stock option exercises | 28.6 | 29.7 | | 2.9 | 15.6 | 15.4 | 4.3 | |
| Taxes paid related to net shares settlement of equity awards | | | | | -0.1 | | | |
| Repurchase and retirement of common stock | | | | | | -300.0 | | |
| Payment of acquisition-related contingent consideration | | | | | | | | |
| Net cash provided by (used in) financing activities | 21.9 | 4.9 | | 41.2 | -121.7 | -9.6 | 30.2 | |
| Effects of foreign exchange changes on cash, cash equivalents, and restricted cash | 2.8 | -3.4 | | -5.9 | 2.2 | -1.5 | 0.7 | |
| Change in cash, cash equivalents, and restricted cash | 170.1 | 100.0 | | -85.4 | 54.5 | 39.6 | -35.4 | |