Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net loss	$ (55.1)	$ (20.9)
Reconciliation of net loss to net cash used in operating activities:
Depreciation and amortization	72.0	73.5
Impairment charges	2.8	3.9
Unrealized foreign exchange loss	5.8	0.0
Stock-based compensation	11.9	14.5
Lease amortization	27.8	27.8
Amortization of debt issuance costs	3.2	1.0
Change in deferred taxes	(34.0)	(76.5)
Bad debt expense	4.3	6.0
Other non-cash operating activities	(36.9)	0.2
Changes in assets and liabilities:
Trade and other receivables	227.6	128.5
Income taxes payable	(14.9)	21.8
Prepaid expenses and other current assets	(56.0)	7.8
Other non-current assets	4.3	(5.3)
Accounts payable and accrued expenses	(109.4)	(116.0)
Accrued compensation	(280.8)	(243.9)
Other current and non-current liabilities	(22.5)	(37.3)
Net cash used in operating activities	(249.9)	(214.9)
Cash flows from investing activities
Payment for property and equipment	(9.8)	(13.7)
Acquisitions of businesses, net of cash acquired	(102.5)	(262.2)
Investments in equity securities	(11.3)	0.0
Other investing activities, net	(7.8)	0.0
Net cash used in investing activities	(131.4)	(275.9)
Cash flows from financing activities
Shares repurchased for payment of employee taxes on stock awards	(8.9)	(3.1)
Repayment of borrowings	0.0	(6.8)
Debt issuance costs	(11.1)	0.0
Payment of finance lease liabilities	(3.6)	(2.8)
Other financing activities, net	(0.3)	0.7
Net cash used in financing activities	(23.9)	(12.0)
Change in cash, cash equivalents and restricted cash	(405.2)	(502.8)
Cash, cash equivalents and restricted cash, beginning of the period	872.3	965.4
Effects of exchange rate fluctuations on cash, cash equivalents and restricted cash	(16.5)	0.7
Cash, cash equivalents and restricted cash, end of the period	$ 450.6	$ 463.3