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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash Flows from Operating Activities    
Net income $ 324.9 $ 144.9
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax (218.6) 0.0
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 67.5 65.6
Stock-based compensation 41.7 23.9
Deferred Income Taxes and Tax Credits (42.4) 0.0
Other 3.7 5.4
Changes in operating assets and liabilities:    
Accounts receivable (99.5) (18.4)
Prepaid expenses and income taxes 12.6 19.2
Accounts payable (12.0) 13.3
Accrued payroll and contract professional pay 75.3 27.9
Income taxes payable 130.6 0.8
Other (7.9) 55.2
Net cash provided by operating activities 275.9 337.8
Cash Flows from Investing Activities:    
Cash paid for property and equipment (25.6) (28.3)
Cash paid for acquisitions, net of cash acquired (224.4) (151.5)
Cash received from sale of discontinued operations 499.1 0.0
Other 0.1 (0.3)
Net cash used in investing activities 249.2 (180.1)
Cash Flows from Financing Activities:    
Proceeds from long-term debt 0.0 65.5
Principal payments of long-term debt 0.0 (65.5)
Debt issuance and amendment costs (1.4) (1.2)
Proceeds from option exercises and employee stock purchase plan 14.3 11.7
Payment of employment taxes related to release of restricted stock awards (13.9) (7.0)
Repurchase of common stock (118.4) (27.9)
Net cash used in financing activities (119.4) (24.4)
Effect of exchange rate changes on cash and cash equivalents (0.7) 1.2
Net Increase in Cash and Cash Equivalents 405.0 134.5
Cash and Cash Equivalents at Beginning of Year 274.4 95.2
Cash and Cash Equivalents at End of Period 679.4 229.7
Supplemental Disclosure of Cash Flow Information Cash paid for:    
Income Taxes Paid 39.6 40.7
Interest 20.1 22.4
Operating leases $ 25.3 $ 25.0