Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income (loss)	$ 48.1	$ 35.3	$ (172.9)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairment	3.7	3.6	234.0
Depreciation and amortization	29.7	25.1	29.3
Non-cash stock-based compensation	9.0	6.1	0.5
Provisions for credit losses on accounts receivable	0.5	0.8	6.4
Deferred income taxes	7.6	12.6	(52.5)
Other	1.3	0.2	2.0
Changes in operating assets and liabilities
Accounts and notes receivable	(27.9)	(29.2)	44.6
Prepaid expenses and other current assets	15.7	(5.4)	(2.1)
Accounts payable	14.7	20.7	(17.5)
Accrued liabilities and other	(9.1)	(16.4)	(31.6)
Net cash provided by operating activities	93.3	53.4	40.2
Investing activities
Purchases of property and equipment	(21.9)	(9.6)	(8.4)
Acquisition of business, net of cash acquired	(30.5)	0.0	0.0
Acquisition of other intangible assets	(1.8)	0.0	0.0
Cost of contracts	0.0	0.0	(2.6)
Proceeds from sale of other investments and equipment	0.2	0.5	1.2
Noncontrolling interest buyout	0.0	0.0	(1.7)
Net cash used in investing activities	(54.0)	(9.1)	(11.5)
Financing activities
Proceeds from credit facility revolver	570.0	371.6	484.1
Payments on credit facility revolver	(559.0)	(387.2)	(488.4)
Proceeds from credit facility term loan	17.2	0.0	0.0
Payments on credit facility term loan	(6.7)	(15.5)	(11.3)
Payments of debt issuance costs	(2.5)	(1.3)	(1.7)
Payments on other long-term borrowings	(9.9)	(7.7)	(5.0)
Distributions to noncontrolling interest	(2.8)	(2.3)	(1.4)
Repurchases of common stock	(48.7)	0.0	(15.3)
Net cash used in financing activities	(42.4)	(42.4)	(39.0)
Effect of exchange rate changes on cash and cash equivalents	(0.2)	(0.1)	0.1
(Decrease) increase in cash and cash equivalents	(3.3)	1.8	(10.2)
Cash and cash equivalents at beginning of year	15.7	13.9	24.1
Cash and cash equivalents at end of year	12.4	15.7	13.9
Cash paid (received) during the period for
Interest	16.9	19.4	18.8
Income taxes, net	$ (7.1)	$ 0.5	$ 2.4