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Income Taxes - Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Gross Unrecognized Income Tax Benefits    
Balance at December 31, 2017 $ 0.3  
Gross amount of increases in unrecognized tax benefits related to prior periods 0.8  
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations (0.2)  
Balance at September 30, 2018 0.9  
Accrued Interest and Penalties    
Unrecognized Tax Benefits, Accrued Interest and Penalties 0.1 $ 0.0
Gross amount of increases in unrecognized tax benefits related to prior periods 0.1  
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations $ 0.0