Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net income (loss)	$ 45.5	$ (17.2)
Reconciliation of net income (loss) to net cash used in operating activities:
Depreciation and amortization	40.6	43.1
Impairment charges	0.1	7.1
Unrealized foreign exchange (gain) loss	(5.6)	1.5
Stock-based compensation	8.7	7.2
Lease amortization	25.1	27.0
Amortization of debt issuance costs	2.4	2.3
Earnings from equity method investments, net of dividends received	(12.5)	0.0
Change in deferred taxes	(12.4)	(25.4)
Provision for loss on receivables and other assets	4.9	12.5
Loss on disposal of business	13.8	0.0
Other operating activities, net	17.8	(6.1)
Changes in assets and liabilities:
Trade and other receivables	16.4	114.2
Income taxes payable	30.4	(14.4)
Short-term contract assets and Prepaid expenses and other current assets	(78.1)	(39.7)
Other non-current assets	(98.4)	(14.8)
Accounts payable and accrued expenses	(7.2)	(12.6)
Accrued compensation	(130.5)	(64.5)
Other current and non-current liabilities	(19.2)	(36.6)
Net cash used in operating activities	(158.2)	(16.4)
Cash flows from investing activities
Payment for property and equipment	(18.9)	(12.9)
Acquisitions of businesses, net of cash acquired	(3.9)	0.0
Investments in equity securities and equity method joint ventures	(11.6)	(15.9)
Collection on beneficial interest in a securitization	80.0	0.0
Other investing activities	(9.3)	0.0
Net cash provided by (used in) investing activities	36.3	(28.8)
Cash flows from financing activities
Shares repurchased for payment of employee taxes on stock awards	(26.2)	(4.8)
Payment of contingent consideration	(0.1)	0.0
Repayment of borrowings	(6.7)	(6.7)
Payment of finance lease liabilities	(3.9)	(3.3)
Other financing activities, net	1.0	1.2
Net cash used in financing activities	(35.9)	(13.6)
Change in cash, cash equivalents and restricted cash	(157.8)	(58.8)
Cash, cash equivalents and restricted cash, beginning of the period	890.3	1,164.1
Effects of exchange rate fluctuations on cash, cash equivalents and restricted cash	(4.3)	(3.5)
Cash, cash equivalents and restricted cash, end of the period	$ 728.2	$ 1,101.8