Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 377.1	$ 347.9
Positions related to the current year	8.2	39.4
Positions related to prior years	3.1	6.8
Settlements with taxing authorities	(3.0)	(6.5)
Lapse of statutes of limitation	(23.5)	(1.1)
Decrease in prior year positions	(12.1)	(6.4)
Cumulative translation adjustment		(3.0)
Cumulative translation adjustment	0.7
Unrecognized tax benefits, ending balance	$ 350.5	$ 377.1

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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