Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	$ 2,181.1	$ 2,860.0	$ 2,889.8
Other comprehensive income (loss) before reclassifications, net	16.1	(335.7)	233.2
Reclassifications, pretax	458.8		21.4
Tax benefit reclassified	1.5		(2.1)
Balance	2,219.3	2,181.1	2,860.0
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(756.9)	(422.0)	(674.5)
Impact of ASU 2016-01 adoption				$ 1.3
Balance	(280.5)	(756.9)	(422.0)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(831.6)	(453.6)	(694.7)
Other comprehensive income (loss) before reclassifications, net	70.5	(378.0)	241.1
Reclassifications, pretax	479.8
Balance	(281.3)	(831.6)	(453.6)
Pension and Post-retirement Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(6.1)	(7.9)	(18.8)
Other comprehensive income (loss) before reclassifications, net	0.6	1.8	2.5
Reclassifications, pretax	(2.1)		10.5
Tax benefit reclassified			(2.1)
Balance	(7.6)	(6.1)	(7.9)
Unrealized Gain (Loss) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance		(1.3)	0.4
Other comprehensive income (loss) before reclassifications, net			(2.2)
Reclassifications, pretax			0.5
Impact of ASU 2016-01 adoption				$ 1.3
Balance			(1.3)
Derivative Financial Instrument Revaluation
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	5.5	0.0	(5.8)
Other comprehensive income (loss) before reclassifications, net	(29.2)	6.0	(4.6)
Reclassifications, pretax	(4.5)	(0.5)	10.4
Tax benefit reclassified	1.5
Balance	(26.7)	5.5	0.0
Non-Controlling Interests
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	75.3	40.8	44.4
Other comprehensive income (loss) before reclassifications, net	(25.8)	34.5	(3.6)
Reclassifications, pretax	(14.4)
Balance	$ 35.1	75.3	$ 40.8
Previously Reported | Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Reclassifications, pretax		$ (0.5)