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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income tax expense	$ 11.5	$ 5.7	$ 31.4	$ 15.6
Effective income tax rate, continuing operations	15.20%	6.20%	9.30%	6.30%
Unrecognized tax benefit liability, including penalties and accrued interest	$ 36.3		$ 36.3		$ 55.2
Foreign Tax Authority [Member]
Change in Liability for Unrecognized Tax Benefits and Related Interest and Penalties			$ 20.0

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Unrecognized tax benefit liability, including penalties and accrued interest

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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