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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities:      
Net Income $ 200.3 $ 174.7 $ 157.7
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 89.7 91.2 95.0
Share-based compensation 32.3 39.3 31.5
Deferred Income Taxes and Tax Credits 1.3 18.9 11.2
Write-off of loan costs 0.0 18.9 0.0
Other 5.9 16.0 18.6
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable (12.9) (24.3) (90.7)
Prepaid expenses and income taxes 6.5 (20.8) 14.8
Income taxes payable (0.3) (2.2) 2.1
Accounts payable 0.8 (7.3) 23.3
Accrued payroll and contract professional pay 12.6 5.0 25.4
Operating Right of Use Assets 31.4 28.0 0.0
Operating Lease Liabilities (31.0) (26.7) 0.0
Payroll tax deferral and other 88.2 2.5 (1.5)
Net cash provided by operating activities 424.8 313.2 287.4
Cash Flows from Investing Activities      
Cash paid for property and equipment (32.6) (32.7) (28.7)
Cash paid for acquisitions, net of cash acquired (186.2) (116.4) (760.2)
Other (0.2) 0.0 0.2
Net cash used in investing activities (219.0) (149.1) (788.7)
Cash Flows from Financing Activities      
Proceeds from Issuance of Long-term Debt 65.5 653.0 822.0
Principal payments of long-term debt (65.5) (736.2) (286.0)
Debt issuance or amendment costs (1.2) (7.8) (22.5)
Proceeds from option exercises and employee stock purchase plan 12.1 12.7 9.4
Payment of employment taxes related to release of restricted stock awards (12.0) (12.2) (5.6)
Repurchase of common stock (27.9) (20.0) 0.0
Other 0.0 0.0 (9.5)
Net cash (used in) provided by financing activities (29.0) (110.5) 507.8
Effect of exchange rate changes on cash and cash equivalents 2.4 (0.2) (1.4)
Net Increase in Cash and Cash Equivalents 179.2 53.4 5.1
Cash and Cash Equivalents 274.4 95.2 41.8
Supplemental Disclosure of Cash Flow Information      
Income taxes 64.2 56.6 21.4
Interest 37.6 44.9 51.0
Non-Cash Investing and Financing Activities:      
Operating lease right-of-use assets obtained in exchange for operating lease liabilities $ 20.6 $ 30.0 $ 0.0