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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, 2017
Mar. 31, 2016
Corporate Debt: Financial institutions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance $ 1.5 $ 0.0
Realized and unrealized gains (losses) included in net income (0.1) 0.0
Purchases 0.6 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 2.0 0.0
Agency mortgage-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 138.7 101.1
Realized and unrealized gains (losses) included in net income (0.3) 1.6
Purchases 29.9 40.4
Sales (17.0) (3.6)
Transfers into Level 3 from Level 2 0.0 1.6
Transfers out of Level 3 to Level 2 [1] 0.0 0.0
Ending balance 151.3 141.1
Non-agency residential mortgage-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 0.0 5.0
Realized and unrealized gains (losses) included in net income 0.0 0.1
Purchases 0.0 0.0
Sales 0.0 (0.1)
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 5.0
Asset-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 59.5 63.0
Realized and unrealized gains (losses) included in net income (0.2) (0.8)
Purchases 31.3 9.0
Sales (5.0) (2.1)
Transfers into Level 3 from Level 2 1.2 9.9
Transfers out of Level 3 to Level 2 [1] (36.8) (15.4)
Ending balance 50.0 63.6
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 24.7 0.0
Realized and unrealized gains (losses) included in net income (0.2) 0.0
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 24.5 0.0
Insurance contracts    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance 7.4 0.0
Realized and unrealized gains (losses) included in net income (0.9) 0.0
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 6.5 0.0
Reinsurance contracts    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening balance (4.0) 0.0
Realized and unrealized gains (losses) included in net income 0.6 0.0
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 $ (3.4) $ 0.0
[1] Transfers out of Level 3 are primarily attributable to the availability of market observable information.