Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (2,184.0)	$ (1,595.6)		$ (1,598.2)	$ (1,657.1)
Foreign currency translation gain (loss)	(603.4)	51.8
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	1.8	(1.0)
Realized gain on interest rate swap	0.5	0.6
Other Comprehensive Income (Loss), Tax	(577.7)		$ 74.6
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(15.4)		(13.2)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	8.0	10.0
Less: Comprehensive (loss) income attributable to noncontrolling interest	(8.3)	(1.0)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	(593.1)	61.4	61.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	7.3		0.1
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(2,072.9)	(1,495.5)		(1,476.8)	(1,547.4)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(595.9)		61.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(7.5)		(9.2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(603.4)		51.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	7.3		0.1
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(127.8)	(106.3)		(129.6)	(105.3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	9.7		2.5
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(7.9)		(3.5)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	1.8		(1.0)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0.0		0.0
AOCI, Derivative Qualifying as Hedge, Excluded Component, Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	2.6	1.0		2.1	0.4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	0.5		0.6
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	0.0		0.0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	0.5		0.6
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0.0		0.0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	14.1	$ 5.2		$ 6.1	$ (4.8)
Net (loss) gain on marketable securities held in trust fund, net of tax	0.0		(0.5)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	8.0		10.0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	8.0		10.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	$ 0.0		$ 0.0