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Income Taxes - Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gross Unrecognized Income Tax Benefits
Gross unrecognized income tax benefits, Beginning Balance	$ 0.3	$ 2.8	$ 2.9
Gross amount of increases in unrecognized tax benefits related to prior periods	0.8		0.3
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
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)
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations	(0.2)
Gross unrecognized income tax benefits, Ending Balance	0.9	0.3	2.8
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	0.1		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
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
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations	0.0
Unrecognized Tax Benefits, Accrued interest and penalties, Ending Balance	$ 0.1	$ 0.0	$ 0.0

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