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Leases - Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating lease expense:        
Operating lease expense $ 21.4 $ 18.7 $ 40.8 $ 36.7
Short-term lease expense 2.8 2.5 6.7 5.7
Variable lease expense 6.3 4.4 12.7 9.7
Finance lease expense:        
Amortization of right-of-use assets 3.1 2.2 5.9 4.4
Interest on lease obligations 1.1 1.1 2.2 2.3
Total lease expense $ 34.7 $ 28.9 $ 68.3 $ 58.8