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Leases - Additional cash flow information (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 57.8 $ 55.8
Operating cash flows from finance leases 0.7 0.5
Financing cash flows from finance leases 1.9 4.2
Right-of-use assets obtained in exchange for new operating leases 42.6 9.4
Right-of-use assets obtained in exchange for new operating leases $ 8.4 $ 7.2