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Debt - Revolving Credit Facility (Details) - USD ($)
$ in Millions
Aug. 31, 2016
Sep. 30, 2017
Jun. 30, 2017
May 31, 2017
Apr. 30, 2017
Dec. 31, 2016
Revolving credit facility            
Debt instruments            
Maximum borrowing capacity   $ 200.0     $ 150.0  
Additional borrowing capacity     $ 25.0 $ 25.0    
Amount outstanding   125.0       $ 45.0
Remaining amount available to borrow   73.6       104.7
Unamortized deferred financing costs   0.4       0.5
Incurred and capitalized deferred financing costs $ 0.5          
Letter of credit            
Debt instruments            
Amount outstanding   $ 1.4       $ 0.3