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Mortgage Loans - Loan Commitments and Related Derivatives (Details) - Financial Services [Member] - USD ($)
$ in Millions
Mar. 31, 2016
Sep. 30, 2015
Interest rate lock commitments [Member]    
Derivative [Line Items]    
Notional amounts of instruments $ 499.7 $ 370.9
Best-efforts and mandatory commitments [Member]    
Derivative [Line Items]    
Notional amounts of instruments 33.6 37.7
Hedging Instruments related to IRLCs [Member]    
Derivative [Line Items]    
Notional amounts of instruments $ 412.8 $ 297.2