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Leases (Capital Lease Receivables) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Leases [Abstract]    
Gross minimum lease payments receivable $ 1,673.7 $ 1,897.0
Unearned interest income (568.3) (671.9)
Lease Receivables, net $ 1,105.4 $ 1,225.1