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Leases - Other Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash paid for amounts included in the measurement of lease obligations:    
Operating cash flows paid for operating leases $ 59.4 $ 51.0
Operating cash flows paid for finance leases 3.4 3.6
Financing cash flows paid for finance leases 9.5 7.5
Right-of-use assets obtained in exchange for new operating lease obligations 65.5 95.1
Right-of-use assets obtained in exchange for new finance lease obligations $ 6.6 $ 16.5