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Leases - Other Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease obligations:    
Operating cash flows paid for operating leases (a) $ 70.1 $ 62.7
Operating cash flows paid for finance leases 4.7 3.7
Financing cash flows paid for finance leases 10.2 7.7
Right-of-use assets obtained in exchange for new operating lease obligations 109.4 60.9
Right-of-use asset obtained in exchange for finance lease liability $ 17.6 $ 4.1