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Mortgage Loans - Loan Commitments and Related Derivatives (Details) - Financial Services and Other [Member] - USD ($)
$ in Millions
Jun. 30, 2017
Sep. 30, 2016
Interest rate lock commitments [Member]    
Derivative [Line Items]    
Notional amounts of instruments $ 656.0 $ 467.6
Best-efforts and mandatory commitments [Member]    
Derivative [Line Items]    
Notional amounts of instruments 54.5 37.2
Hedging Instruments related to IRLCs [Member]    
Derivative [Line Items]    
Notional amounts of instruments $ 554.6 $ 385.5