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Leases - Other Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash paid for amounts included in the measurement of lease obligations:    
Operating cash flows paid for operating leases (a) $ 18.2 $ 17.3
Operating cash flows paid for finance leases 1.1 1.2
Financing cash flows paid for finance leases 2.4 2.3
Right-of-use assets obtained in exchange for new operating lease obligations 9.2 35.6
Right-of-use assets obtained in exchange for new finance lease obligations $ 1.2 $ 8.2