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Leases - Other Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash paid for amounts included in the measurement of lease obligations:    
Operating cash flows paid for operating leases (a) $ 37.5 $ 33.1
Operating cash flows paid for finance leases 2.3 2.3
Financing cash flows paid for finance leases 6.1 4.6
Right-of-use assets obtained in exchange for new operating lease obligations 55.7 48.7
Right-of-use assets obtained in exchange for new finance lease obligations $ 5.4 $ 11.7