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Mortgage Loans - Mortgage Loans Held for Sale (Details) - Financial Services [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Loans Receivable [Line Items]          
Mortgage loans held for sale $ 634.5   $ 634.5   $ 631.0
Aggregate outstanding principal amounts 609.3   609.3   608.9
Mortgage loans originated     4,000.0 $ 3,600.0  
Mortgage loans sold     4,000.0 3,500.0  
Net gain on sales of loans 59.8 $ 52.2 $ 143.6 $ 125.7  
Percentage of mortgage loans sold to significant purchasers     92.00%    
Percentage of mortgage loans sold to one significant purchaser     27.00%    
Uncommitted Loans [Member]          
Loans Receivable [Line Items]          
Mortgage loans held for sale 403.8   $ 403.8   385.3
Hedging Instruments related to IRLCs [Member]          
Loans Receivable [Line Items]          
Notional amounts of hedging instruments, Total $ 403.6   $ 403.6   $ 383.8