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 |