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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Amounts payable under non-cancelable operating lease commitments      
2020 $ 236.2    
2021 198.3    
2022 166.0    
2023 131.1    
2024 105.0    
Thereafter 405.8    
Total 1,242.4    
Leases, additional disclosures      
Rent expense for all leases $ 258.1 $ 268.5 $ 265.9