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Income Taxes - Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gross Unrecognized Income Tax Benefits
Gross unrecognized income tax benefits, Beginning Balance	$ 2.8	$ 2.9	$ 0.9
Gross amount of increases in unrecognized tax benefits related to prior periods		0.3	1.7
Gross amount of decreases in unrecognized tax benefits related to prior periods	(0.4)	(0.4)
Gross amount of increases in unrecognized tax benefits related to current periods	51.3	0.1	0.3
Gross amount of decreases in unrecognized tax benefits related to current periods		(0.1)
Decreases in unrecognized tax benefits relating to settlements with taxing authorities	(2.1)
Gross unrecognized income tax benefits, Ending Balance	0.3	2.8	2.9
Accrued Interest and Penalties
Unrecognized Tax Benefits, Accrued interest and penalties, Beginning Balance	0.0	0.0	0.0
Gross amount of increases in unrecognized tax benefits related to prior periods		0.0	0.0
Gross amount of decreases in unrecognized tax benefits related to prior periods	0.0	0.0
Gross amount of increases in unrecognized tax benefits related to current period		0.0	0.0
Gross amount of decreases in unrecognized tax benefits related to current periods		0.0
Decreases in unrecognized tax benefits relating to settlements with taxing authorities	0.0
Unrecognized Tax Benefits, Accrued interest and penalties, Ending Balance	$ 0.0	$ 0.0	$ 0.0

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Unrecognized Tax Benefits Income Tax Penalties and Interest Accrued Decreases Resulting from Current Period Tax Positions

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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