Equity and Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity
Beginning balance	$ 889.0	$ 805.2
Ending balance	1,232.4	889.0
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Beginning balance	(29.9)	(8.1)
Other comprehensive income (loss) before reclassifications, net of a tax expense	(6.4)	(24.6)
Amounts reclassified from accumulated other comprehensive loss, net of taxes	0.4	2.8
Net current-period other comprehensive loss, net of taxes	(6.0)	(21.8)
Ending balance	(35.9)	(29.9)
Foreign currency translation adjustments
Increase (Decrease) in Stockholders' Equity
Beginning balance	(17.5)	2.2
Other comprehensive income (loss) before reclassifications, net of a tax expense	(7.5)	(21.6)
Amounts reclassified from accumulated other comprehensive loss, net of taxes	0.0	1.9
Net current-period other comprehensive loss, net of taxes	(7.5)	(19.7)
Ending balance	(25.0)	(17.5)
Pension liability adjustments, net of taxes
Increase (Decrease) in Stockholders' Equity
Beginning balance	(12.4)	(10.3)
Other comprehensive income (loss) before reclassifications, net of a tax expense	1.1	(3.0)
Amounts reclassified from accumulated other comprehensive loss, net of taxes	0.4	0.9
Net current-period other comprehensive loss, net of taxes	1.5	(2.1)
Ending balance	$ (10.9)	$ (12.4)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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