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Comprehensive Income - Components of Other Comprehensive Income (Loss), Net of Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]
Beginning Balance	$ 4,134.9	$ 4,578.5	$ 4,426.5
Other comprehensive income	12.6	(102.2)	119.5
Ending Balance	3,499.1	4,134.9	4,578.5
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]
Beginning Balance	(188.0)	(85.9)
Other comprehensive income (loss) before reclassifications	10.9	(102.1)
Amounts reclassified	0.0	0.0
Other comprehensive income	10.9	(102.1)	128.0
Ending Balance	(177.1)	(188.0)	(85.9)
Realized and Unrealized Gains (Losses) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]
Beginning Balance	(0.5)	(0.4)
Other comprehensive income (loss) before reclassifications	2.2	(0.2)
Amounts reclassified	(0.5)	0.1
Other comprehensive income	1.7	(0.1)	(0.8)
Ending Balance	1.2	(0.5)	(0.4)
Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]
Beginning Balance	0.0	2.1
Other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified	0.0	(2.1)
Other comprehensive income	0.0	(2.1)
Ending Balance	0.0	0.0	2.1
Total
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]
Beginning Balance	(188.5)	(84.2)
Other comprehensive income (loss) before reclassifications	13.1	(102.3)
Amounts reclassified	(0.5)	(2.0)
Other comprehensive income	12.6	(104.3)
Ending Balance	$ (175.9)	$ (188.5)	$ (84.2)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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