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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income tax expense	$ 2.0	$ 2.4	$ 19.9	$ 9.9
Effective income tax rate, continuing operations	1.30%	3.60%	7.60%	6.40%
Unrecognized tax benefit liability, including penalties and accrued interest	$ 34.1		$ 34.1		$ 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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