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Leases (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]      
Operating lease expense $ 89.5 $ 80.1  
Use of cash for payments on operating leases 98.8 90.0  
Noncash ROU asset additions 259.0 442.0  
Expected lease payments for operating leases that have not yet commenced 195.0    
Interest income on lease receivables 67.4 71.2  
Lease receivables, net 824.7 903.0  
Lease payments collected during the period 166.2 162.8 $ 171.6
Reduction in lease receivable balance $ 98.8 $ 91.6 $ 94.6