Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ 2,860.0	$ 2,889.8	$ 2,273.3
Impact of ASU 2016-01 adoption				$ 1.3
Other comprehensive income (loss) before reclassifications, net	(335.7)	233.2	200.5
Reclassifications, pretax	(0.5)	21.4	11.1
Tax benefit reclassified	0.0	(2.1)	0.0
Balance	2,181.1	2,860.0	2,889.8
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(422.0)	(674.5)	(886.1)
Balance	(756.9)	(422.0)	(674.5)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		(694.7)	(899.3)
Other comprehensive income (loss) before reclassifications, net	(378.0)	241.1	204.6
Reclassifications, pretax	0.0	0.0	0.0
Tax benefit reclassified	0.0	0.0	0.0
Balance	(831.6)		(694.7)
Pension and Post-retirement Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		(18.8)	(26.3)
Other comprehensive income (loss) before reclassifications, net	1.8	2.5	8.3
Reclassifications, pretax	0.0	10.5	(0.8)
Tax benefit reclassified	0.0	(2.1)	0.0
Balance	(6.1)		(18.8)
Unrealized Gain (Loss) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		0.4	1.2
Impact of ASU 2016-01 adoption				$ 1.3
Other comprehensive income (loss) before reclassifications, net	0.0	(2.2)	(0.8)
Reclassifications, pretax	0.0	0.5	0.0
Tax benefit reclassified	0.0	0.0	0.0
Balance	0.0		0.4
Derivative Financial Instrument Revaluation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		(5.8)	(8.1)
Other comprehensive income (loss) before reclassifications, net	6.0	(4.6)	(9.6)
Reclassifications, pretax	(0.5)	10.4	11.9
Tax benefit reclassified	0.0	0.0	0.0
Balance	5.5		(5.8)
Non-Controlling Interests
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		44.4	46.4
Other comprehensive income (loss) before reclassifications, net	34.5	(3.6)	(2.0)
Reclassifications, pretax	0.0	0.0	0.0
Tax benefit reclassified	0.0	0.0	0.0
Balance	75.3		$ 44.4
Previously Reported
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	2,860.0
Balance		2,860.0
Previously Reported | Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(422.0)
Balance		(422.0)
Previously Reported | Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(453.6)
Balance		(453.6)
Previously Reported | Pension and Post-retirement Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(7.9)
Balance		(7.9)
Previously Reported | Unrealized Gain (Loss) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(1.3)
Balance		(1.3)
Previously Reported | Derivative Financial Instrument Revaluation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	0.0
Balance		0.0
Previously Reported | Non-Controlling Interests
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ 40.8
Balance		$ 40.8