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Commitments and Contingencies, Consolidated Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Consolidated Lease Expense [Abstract]    
Fixed lease expense $ 13.4  
Variable lease expense 1.8  
Subtotal operating lease expense 15.2  
Short-term lease expense 11.8  
Total operating lease expense $ 27.0 $ 25.6