Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	$ 1,719.2
Unrealized gains (losses), arising during the period	8.9
Amounts reclassified out of AOCI during the period, gross	0.2
Noncontrolling interests	0.6
Deferred taxes on unrealized gains (losses), arising during the period	(6.2)
Balance end of period	1,516.6
Accumulated other comprehensive loss	(413.7)	$ (417.2)
Accumulated Other Comprehensive Income Loss [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(417.2)
Balance end of period	(413.7)
Foreign Currency Translation [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(456.8)
Unrealized gains (losses), arising during the period	33.8
Amounts reclassified out of AOCI during the period, gross	0.2
Noncontrolling interests	0.6
Deferred taxes on unrealized gains (losses), arising during the period	(0.3)
Balance end of period	(422.5)
Currency Derivative Contracts [Member] | Foreign Exchange Contract [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	40.3
Unrealized gains (losses), arising during the period	(17.1)
Amounts reclassified out of AOCI during the period, gross	0.0
Noncontrolling interests	0.0
Deferred taxes on unrealized gains (losses), arising during the period	(7.8)
Balance end of period	15.4
Currency Derivative Contracts [Member] | Interest Rate Swap [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance beginning of period	(0.7)
Unrealized gains (losses), arising during the period	(7.8)
Amounts reclassified out of AOCI during the period, gross	0.0
Noncontrolling interests	0.0
Deferred taxes on unrealized gains (losses), arising during the period	1.9
Balance end of period	(6.6)
AOCI Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive loss	$ 358.4