XML 67 R55.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage loans held for sale $ 538.2   $ 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 7.2 $ 7.7 5.6 $ 6.8
Debt securities collateralized by residential real estate 8.8   8.8  
Loans Receivable [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net realized and unrealized gains (losses) (0.1) 0.0    
Purchases 0.0 0.0    
Sales and Settlements (0.5) 0.0    
Principal Reductions 0.0 0.0    
Net transfers to (out of) Level 3 2.2 $ 0.9    
Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net realized and unrealized gains (losses) 0.0      
Purchases 0.0      
Sales and Settlements 0.0      
Principal Reductions 0.0      
Net transfers to (out of) Level 3 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