Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	$ 2,219.3	$ 2,181.1	$ 2,860.0
Balance	2,318.1	2,219.3	2,181.1	$ 2,860.0
Accounting Standards Update				us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance			2,860.0
Balance				$ 2,860.0
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(280.5)	(756.9)	(422.0)
Other comprehensive income (loss) before reclassifications, net	71.6	16.1	(335.7)
Reclassifications, pretax	14.1	458.8	(0.5)
Tax expense reclassified		1.5
Balance	(194.8)	(280.5)	(756.9)	(422.0)
Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance			1.3
Balance				1.3
Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance			(420.7)
Balance				(420.7)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(281.3)	(831.6)	(453.6)
Other comprehensive income (loss) before reclassifications, net	107.4	70.5	(378.0)
Reclassifications, pretax		479.8
Balance	(173.9)	(281.3)	(831.6)	(453.6)
Foreign Currency Translation Adjustments | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance			(453.6)
Balance				(453.6)
Pension and Post-retirement Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(7.6)	(6.1)	(7.9)
Other comprehensive income (loss) before reclassifications, net	4.4	0.6	1.8
Reclassifications, pretax		(2.1)
Balance	(3.2)	(7.6)	(6.1)	(7.9)
Pension and Post-retirement Plans | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance			(7.9)
Balance				(7.9)
Unrealized Gain (Loss) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	0.0	0.0	(1.3)
Balance	0.0	0.0	0.0	(1.3)
Unrealized Gain (Loss) on Available for Sale Securities | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance			1.3
Balance				1.3
Derivative Financial Instrument Revaluation
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(26.7)	5.5
Other comprehensive income (loss) before reclassifications, net	(40.2)	(29.2)	6.0
Reclassifications, pretax	14.1	(4.5)	(0.5)
Tax expense reclassified		1.5
Balance	(52.8)	(26.7)	5.5
Non-Controlling Interests
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	35.1	75.3	40.8
Other comprehensive income (loss) before reclassifications, net	0.0	(25.8)	34.5
Reclassifications, pretax		(14.4)
Balance	$ 35.1	$ 35.1	75.3	40.8
Non-Controlling Interests | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance			$ 40.8
Balance				$ 40.8