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Leases - Additional cash flow information (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 49.0 $ 50.8
Operating cash flows from finance leases 0.6 0.5
Financing cash flows from finance leases 5.4 4.3
Right-of-use assets obtained in exchange for new operating leases 26.9 14.7
Right-of-use assets obtained in exchange for new finance leases $ 10.8 $ 7.9