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Leases - Net operating lease cost (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease Cost        
Operating lease cost $ 62.8 $ 60.5 $ 124.3 $ 120.5
Sublease income (6.7) (6.5) (13.0) (12.9)
Total lease cost $ 56.1 $ 54.0 $ 111.3 $ 107.6