Income Taxes - Schedule of Unrecognized Tax Benefits Roll Forward (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits at January 1	$ 59.2	$ 56.8
Increases related to: tax positions taken during a prior period	0.0	7.1
Increases related to: tax positions taken during the current period	0.5	0.4
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(0.1)	(0.1)
Decreases related to: lapse of applicable statute of limitations	(1.1)	(4.8)
Decreases related to: settlements with taxing authorities	0.0	(0.2)
Unrecognized tax benefits at December 31	$ 58.5	$ 59.2

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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- Definition

Amount of unrecognized tax benefits.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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