Accumulated Other Comprehensive Loss - Details of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (348.6)
Other comprehensive income (loss) before reclassifications	21.4	$ 18.0
Less: amounts reclassified from accumulated other comprehensive loss	0.4	1.1
Other comprehensive (loss) income	21.8	19.1
Ending balance	(292.4)
ASU 2018-02
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Tax Cuts And Jobs Act Of 2017, tax effect, reclassification from Accumulated Other Comprehensive Loss to retained earnings, tax effect			$ 13.4
Unrecognized Pension Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(136.4)	(103.4)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Less: amounts reclassified from accumulated other comprehensive loss	0.8	0.6
Other comprehensive (loss) income	0.8	0.6
Ending balance	(135.6)	(102.8)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(744.8)	(694.4)
Other comprehensive income (loss) before reclassifications	15.5	28.4
Less: amounts reclassified from accumulated other comprehensive loss	0.0	0.0
Other comprehensive (loss) income	15.5	28.4
Ending balance	(729.3)	(666.0)
Cumulative Translation Adjustment | Intra-entity transactions
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Intra-entity currency translation adjustment in AOCI	6.4	(16.5)
Unrecognized Gains (Losses) on Derivative Instruments | Net Investment Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(41.9)	(46.8)
Other comprehensive income (loss) before reclassifications	6.8	(10.7)
Less: amounts reclassified from accumulated other comprehensive loss	0.0	0.0
Other comprehensive (loss) income	6.8	(10.7)
Ending balance	(35.1)	(57.5)
Unrecognized Gains (Losses) on Derivative Instruments | Cash Flow Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2.7	(0.3)
Other comprehensive income (loss) before reclassifications	(0.9)	0.3
Less: amounts reclassified from accumulated other comprehensive loss	(0.4)	0.5
Other comprehensive (loss) income	(1.3)	0.8
Ending balance	1.4	0.5
Accumulated Other Comprehensive Loss, Net of Taxes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(920.4)	(844.9)
Ending balance	$ (898.6)	$ (825.8)