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Income Taxes - Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 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  
Balance at June 30, 2018 1.1  
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