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Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage loans held for sale $ 658.2   $ 587.3  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage loans held for sale 4.4 $ 8.4 5.6 $ 6.8
Debt securities collateralized by residential real estate 8.8 3.9 8.8 $ 0.0
Loans Receivable [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net realized and unrealized gains (losses) 0.6 (0.1)    
Purchases 0.0 0.0    
Sales and Settlements (6.3) (1.7)    
Principal Reductions 0.0 0.0    
Net transfers to (out of) Level 3 4.5 3.4    
Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net realized and unrealized gains (losses) 0.0 0.0    
Purchases 0.0 3.9    
Sales and Settlements 0.0 0.0    
Principal Reductions 0.0 0.0    
Net transfers to (out of) Level 3 0.0 $ 0.0    
Homebuilding [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage loans held for sale $ 0.0   $ 0.0