Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	$ 1,960.5
Other comprehensive income (loss) before reclassifications	(23.9)
Amounts reclassified from accumulated other comprehensive loss	1.5
Other comprehensive (loss) income	(22.4)	$ 8.3
Ending equity	1,928.5
Cash flow hedge (loss) gain
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(0.5)
Other comprehensive income (loss) before reclassifications	1.8
Amounts reclassified from accumulated other comprehensive loss	(0.2)
Other comprehensive (loss) income	1.6
Ending equity	1.1
Unrealized gain (loss) on available-for- sale securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	0.6
Other comprehensive income (loss) before reclassifications	(0.1)
Amounts reclassified from accumulated other comprehensive loss	0.0
Other comprehensive (loss) income	(0.1)
Ending equity	0.5
Pension and post retirement benefit plan adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(203.2)
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified from accumulated other comprehensive loss	1.7
Other comprehensive (loss) income	1.7
Ending equity	(201.5)
Cumulative translation adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(129.8)
Other comprehensive income (loss) before reclassifications	(25.6)
Amounts reclassified from accumulated other comprehensive loss	0.0
Other comprehensive (loss) income	(25.6)
Ending equity	(155.4)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(332.9)	(285.7)
Other comprehensive (loss) income	(22.4)	8.3
Ending equity	$ (355.3)	$ (307.4)

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

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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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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