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Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 16, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Sep. 29, 2016
Derivative [Line Items]          
Premium paid to amend strike rate $ 0.9        
Interest rate cap derivative   $ 0.7 $ 0.7    
Changes in fair value of interest rate cap     $ 0.2 $ 0.2  
Interest rate cap          
Derivative [Line Items]          
Notional amount of interest rate cap         $ 489.3
Increase (decrease) interest expense   $ (0.1)      
One-Month LIBOR | Interest rate cap          
Derivative [Line Items]          
Interest rate cap, strike rate 1.80%       2.938%