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Subsequent Events (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]          
Depreciation     $ 29.9 $ 27.0 $ 17.9
Line of Credit | Wells Fargo Credit Facility | Subsequent Event          
Subsequent Event [Line Items]          
Repayments of lines of credit $ 5.0        
Lestina          
Subsequent Event [Line Items]          
Settlement agreement, paid     $ 2.2    
Forecast | Subsequent Event          
Subsequent Event [Line Items]          
Depreciation   $ 3.0