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Leases - Components of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 10.0 $ 20.0
Variable lease cost 1.5 2.8
Total lease cost $ 11.5 $ 22.8