Income Taxes (Accounting for Uncertainty in 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]
Gross unrecognized tax benefits - beginning of the year	$ 13.1	$ 18.7
Increases as a resulting of tax positions taken during a prior-year period	3.0	0.8
Decreases as a result of tax positions taken during a prior-year period	(0.2)	(0.3)
Increases as a result of tax positions taken during the current period	1.2	1.6
Decreases relating to settlements with tax authorities	(3.8)	(2.5)
Reductions as a result of lapse of the applicable statute of limitations	(0.7)	(5.2)
Gross unrecognized tax benefits - end of the year	$ 12.6	$ 13.1

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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