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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment, Net, by Type [Abstract]      
Total cost $ 1,459.8 $ 1,394.0  
Less: accumulated depreciation and amortization (942.6) (870.8)  
Property and Equipment, Net $ 517.2 523.2 $ 510.1
Minimum [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Property and Equipment, Useful Lives 3 years    
Maximum [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Property and Equipment, Useful Lives 35 years    
Furniture, software and equipment [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Total cost $ 804.7 756.4  
Furniture, software and equipment [Member] | Minimum [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Property and Equipment, Useful Lives 3 years    
Furniture, software and equipment [Member] | Maximum [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Property and Equipment, Useful Lives 10 years    
Premises and leasehold improvements [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Total cost $ 580.9 563.5  
Premises and leasehold improvements [Member] | Minimum [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Property and Equipment, Useful Lives 5 years    
Premises and leasehold improvements [Member] | Maximum [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Property and Equipment, Useful Lives 35 years    
Land [Member]      
Property, Plant and Equipment, Net, by Type [Abstract]      
Total cost $ 74.2 $ 74.1