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Leases (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Leases [Abstract]      
Capital leases, plant and equipment $ 22.7 $ 12.8  
Capital leases, accumulated depreciation 4.8 4.3  
Operating leases, rent expense 80.8 88.2 $ 97.9
Future capital lease payment present value 10.2    
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Lessor, lease payments collected 186.0 148.1 134.4
Receivable Balance Reduction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Lessor, lease payments collected $ 85.5 $ 69.3 $ 72.7