Accumulated Other Comprehensive Income - Net Changes in Components of AOCI, Including Tax Effect (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Unrealized translation	$ (4.2)	$ (15.0)
Defined benefit pension plans	0.0	0.3
Tax effect	0.0	(0.1)
Defined benefit pension plans, net of tax	0.0	0.2
Cash flow hedges	0.0	(0.1)
Tax effect	0.0	0.0
Cash flow hedges, net of tax	0.0	(0.1)
Change in AOCI	$ (4.2)	$ (14.9)

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive (income) loss for defined benefit plan, attributable to parent entity.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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