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Commitments and Contingent Liabilities (Details 2) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 $ 73.3    
2019 62.4    
2020 52.1    
2021 36.6    
2022 25.8    
Beyond 2022 34.8    
Total 285.0    
Leases, Operating [Abstract]      
Rental expense $ 115.1 $ 115.5 $ 117.0