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Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefit — opening balance	$ 20.3	$ 31.3	$ 37.9
Gross increases — tax positions in prior period	1.1	0.6	1.6
Gross decreases — tax positions in prior period	(0.8)	(2.4)	(0.3)
Gross increases — tax positions in current period	0.2	0.7	0.3
Settlements	(2.1)	0.0	(1.3)
Lapse of statute of limitations	(1.5)	(9.8)	(7.1)
Decrease due to foreign currency exchange rates	0.0	(0.1)
Increase due to foreign currency exchange rates			0.2
Unrecognized tax benefit — ending balance	$ 17.2	$ 20.3	$ 31.3

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- Definition

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

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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