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Leases - Other Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash paid for amounts included in the measurement of lease obligations:    
Operating cash flows paid for operating leases $ 33.1 $ 27.8
Operating cash flows paid for finance leases 2.3 2.4
Financing cash flows paid for finance leases 4.6 3.3
Right-of-use assets obtained in exchange for new operating lease obligations 48.7 55.0
Right-of-use assets obtained in exchange for new finance lease obligations $ 11.7 $ 0.0