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Leases - Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease expense $ 22.2 $ 41.2
Finance lease expense:    
Amortization of right-of-use assets 2.3 4.2
Interest on lease obligations 1.2 2.4
Total lease expense $ 25.7 $ 47.8