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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Valuation Allowance [Line Items]
Tax benefit	$ 5.3	$ (121.5)	$ 6.1	$ 9.5		$ (116.9)	$ 17.3
Increase (decrease) in valuation allowance					$ 120.2
Federal income tax at statutory rate (as a percent)						35.00%
Unrecognized tax benefits	17.6					$ 17.6		$ 19.4
Spin Off Transaction
Valuation Allowance [Line Items]
Increase (decrease) in valuation allowance	$ (7.1)					$ 113.1