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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash Flows from Operating Activities    
Net income $ 139.3 $ 112.9
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 39.8 43.4
Stock-based compensation 24.0 21.1
Other 5.1 2.8
Changes in operating assets and liabilities, net of effects of acquisitions and divestiture:    
Accounts receivable (136.7) (36.0)
Prepaid expenses and income taxes 23.7 6.8
Accounts payable 12.1 (5.8)
Accrued payroll and contract professional pay 31.9 50.5
Income taxes payable 8.0 17.3
Other (2.8) (8.3)
Net cash provided by operating activities 144.4 204.7
Cash Flows from Investing Activities    
Cash paid for property and equipment (18.4) (17.6)
Cash paid for acquisitions, net of cash acquired 0.0 (85.8)
Cash received from sale of the Oxford business 9.8 0.0
Other 2.5 0.0
Net cash used in investing activities (6.1) (103.4)
Cash Flows from Financing Activities    
Proceeds from option exercises and employee stock purchase plan 10.4 7.7
Repurchases of common stock (168.1) 0.0
Payment of employment taxes related to release of restricted stock awards (11.3) (7.1)
Payment of contingent consideration (8.1) 0.0
Debt issuance and amendment costs 0.0 (0.5)
Net cash provided by (used in) financing activities (177.1) 0.1
Effect of exchange rate changes on cash and cash equivalents (0.2) (0.4)
Net increase (decrease) in cash and cash equivalents (39.0) 101.0
Cash and cash equivalents at beginning of year 529.6 274.4
Cash and cash equivalents at end of period 490.6 375.4
Supplemental Disclosure of Cash Flow Information    
Income taxes 17.7 17.7
Interest 18.4 17.6
Operating leases 13.6 17.2
Noncash transactions —    
Operating lease right of use assets obtained in exchange for operating lease liabilities $ 9.8 $ 1.5