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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Valuation Allowance [Line Items]
Tax (benefits) expense	$ (13.1)	$ (5.3)	$ (9.3)	$ 103.1
Federal income tax at statutory rate (as a percent)			35.00%
Unrecognized tax benefits	14.9		$ 14.9		$ 15.8
Spin Off Transaction
Valuation Allowance [Line Items]
Increase (decrease) in valuation allowance			$ 106.4
Internal Revenue Service | Tax Years 2012 Through 2014
Valuation Allowance [Line Items]
Discrete tax benefit	$ 13.7

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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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Amount of unrecognized tax benefits.

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