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Leases (Lease Receivables) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Leases [Abstract]    
Gross minimum lease payments receivable $ 1,897.0 $ 2,072.6
Unearned interest income (671.9) (762.7)
Lease Receivables, net $ 1,225.1 $ 1,309.9