Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net (loss) income	$ (172.9)	$ 51.7	$ 56.4
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Impairments	234.0	0.0	0.0
Depreciation and amortization	29.3	29.3	18.8
Non-cash stock-based compensation	0.5	4.9	3.1
Provisions for credit losses on accounts receivable	6.4	1.1	1.5
Deferred income taxes	(52.5)	4.2	1.3
Gain on sale of equity method investment	0.0	0.0	(10.1)
Other	2.0	0.5	(0.3)
Changes in operating assets and liabilities
Notes and accounts receivable	44.6	(12.7)	(16.7)
Prepaid and other current assets	(2.1)	(6.9)	0.1
Accounts payable	(17.5)	5.2	0.8
Accrued liabilities and other	(31.6)	(1.3)	16.0
Net cash provided by operating activities	40.2	76.0	70.9
Investing activities
Purchase of leasehold improvements and equipment	(8.4)	(10.2)	(8.9)
Cost of contracts purchased	(2.6)	(2.6)	(1.1)
Proceeds from sale of other investments and equipment	1.2	0.3	0.2
Proceeds from sale of equity method investment	0.0	0.0	19.3
Noncontrolling interest buyout	(1.7)	0.0	0.0
Acquisition of business, net of cash acquired	0.0	0.0	(277.9)
Net cash used in investing activities	(11.5)	(12.5)	(268.4)
Financing activities
Proceeds from credit facility revolver	484.1	455.6	333.5
Payments on credit facility revolver	(488.4)	(470.6)	(186.3)
Proceeds from credit facility term loan	0.0	0.0	225.0
Payments on credit facility term loan	(11.3)	(11.3)	(150.0)
Payments of debt issuance costs	(1.7)	0.0	(3.2)
Payments on other long-term borrowings	(5.0)	(2.3)	(0.5)
Distributions to noncontrolling interest	(1.4)	(3.2)	(3.3)
Repurchases of common stock	(15.3)	(47.6)	0.0
Net cash (used in) provided by financing activities	(39.0)	(79.4)	215.2
Effect of exchange rate changes on cash and cash equivalents	0.1	0.1	(0.6)
(Decrease) increase in cash and cash equivalents	(10.2)	(15.8)	17.1
Cash and cash equivalents at beginning of year	24.1	39.9	22.8
Cash and cash equivalents at end of year	13.9	24.1	39.9
Cash paid during the period for
Interest	18.8	17.9	8.5
Income taxes	$ 2.4	$ 15.3	$ 15.3