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Fair Value Of Financial Instruments (Schedule Of Fair Value Measurement Using Significant Unobservable Inputs Level Three) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Total mortgage-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance $ 106.1 $ 181.8
Realized and unrealized gains (losses) included in net income 1.7 1.4
Purchases 40.4 20.1
Sales (3.7) (70.6)
Transfers into Level 3 from Level 2 1.6 0.0
Transfers out of Level 3 to Level 2 0.0 [1] 0.0
Ending balance 146.1 132.7
Agency mortgage-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 101.1 180.1
Realized and unrealized gains (losses) included in net income 1.6 1.3
Purchases 40.4 18.3
Sales (3.6) (67.0)
Transfers into Level 3 from Level 2 1.6 0.0
Transfers out of Level 3 to Level 2 [1] 0.0 0.0
Ending balance 141.1 132.7
Non-agency residential mortgage-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 5.0 0.0
Realized and unrealized gains (losses) included in net income 0.1 0.0
Purchases 0.0 0.0
Sales (0.1) 0.0
Transfers into Level 3 from Level 2 0.0 0.0
Transfers out of Level 3 to Level 2 [1] 0.0 0.0
Ending balance 5.0 0.0
Commercial mortgage-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 0.0 1.7
Realized and unrealized gains (losses) included in net income 0.0 0.1
Purchases 0.0 1.8
Sales 0.0 (3.6)
Transfers into Level 3 from Level 2 0.0 0.0
Transfers out of Level 3 to Level 2 [1] 0.0 0.0
Ending balance 0.0 0.0
Asset-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 63.0 55.4
Realized and unrealized gains (losses) included in net income (0.8) 0.4
Purchases 9.0 25.3
Sales (2.1) (2.7)
Transfers into Level 3 from Level 2 9.9 43.6
Transfers out of Level 3 to Level 2 [1] (15.4) (29.1)
Ending balance 63.6 92.9
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 0.0 43.3
Realized and unrealized gains (losses) included in net income 0.0 5.4
Purchases 0.0 0.0
Sales 0.0 0.0
Transfers into Level 3 from Level 2 0.0 0.0
Transfers out of Level 3 to Level 2 [1] 0.0 0.0
Ending balance $ 0.0 $ 48.7
[1] Transfers out of Level 3 are primarily attributable to the availability of market observable information.