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Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Valuation Allowance [Line Items]
Tax benefit	$ 10.7	$ 13.1	$ 8.0	$ 9.3
Federal income tax at statutory rate (as a percent)			21.00%		35.00%
Unrecognized tax benefits	15.3		$ 15.3		$ 19.5
U.K.
Valuation Allowance [Line Items]
Discrete tax benefit	$ 13.2
Internal Revenue Service | Tax Years 2012 Through 2014
Valuation Allowance [Line Items]
Discrete tax benefit		$ 13.7

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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