XML 75 R75.htm IDEA: XBRL DOCUMENT v2.4.0.8
Derivatives (Uncollateralized Amounts Due Under WM Life Re's OTC Derivative Contracts) (Details) (White Mountains Life Re, USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Rating
Dec. 31, 2012
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments $ 91.5 [1] $ 98.3 [1]
Collertal provided to counterparty in cash 7.4 45.3
Collateral provided to counterparty in financial instruments 0.70 0
Net amount of exposure after effect of collateral 99.6 143.6
Excess collateral provided to counterparty in cash 41.6 81.1
Derivative, Collateral, Right to Reclaim Securities 23.8 28.0
Counter-party collateral held by WMLife Re - Cash 0 30.6
Net amount of exposure to counter-party 165.0 222.1
S and P Credit Ratings 21  
A | Bank of America [Member]
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments 43.1 78.5
Collertal provided to counterparty in cash 0 0
Collateral provided to counterparty in financial instruments 0 0
Net amount of exposure after effect of collateral 43.1 78.5
Excess collateral provided to counterparty in cash 0 0
Derivative, Collateral, Right to Reclaim Securities 0 0
Counter-party collateral held by WMLife Re - Cash 0 30.6
Net amount of exposure to counter-party 43.1 47.9
A | Barclays
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments 2.6  
Collertal provided to counterparty in cash 0  
Collateral provided to counterparty in financial instruments 0  
Net amount of exposure after effect of collateral 2.6  
Excess collateral provided to counterparty in cash 0  
Derivative, Collateral, Right to Reclaim Securities 0  
Counter-party collateral held by WMLife Re - Cash 0  
Net amount of exposure to counter-party 2.6  
A | Royal Bank of Scotland
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments 18.3 33.6
Collertal provided to counterparty in cash 0 0
Collateral provided to counterparty in financial instruments 0 0
Net amount of exposure after effect of collateral 18.3 33.6
Excess collateral provided to counterparty in cash 0 0
Derivative, Collateral, Right to Reclaim Securities 0 0
Counter-party collateral held by WMLife Re - Cash 0 0
Net amount of exposure to counter-party 18.3 33.6
A | Citigroup - OTC
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments 23.1 19.9
Collertal provided to counterparty in cash 0 0
Collateral provided to counterparty in financial instruments 0 0
Net amount of exposure after effect of collateral 23.1 19.9
Excess collateral provided to counterparty in cash 2.4 30.8
Derivative, Collateral, Right to Reclaim Securities 0 0
Counter-party collateral held by WMLife Re - Cash 0 0
Net amount of exposure to counter-party 25.5 50.7
A | Citigroup Exchange Traded [Member]
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments (3.8) (21.5)
Collertal provided to counterparty in cash 3.8 21.5
Collateral provided to counterparty in financial instruments 0 0
Net amount of exposure after effect of collateral 0 0
Excess collateral provided to counterparty in cash 19.8 13.6
Derivative, Collateral, Right to Reclaim Securities 0 0
Counter-party collateral held by WMLife Re - Cash 0 0
Net amount of exposure to counter-party 19.8 13.6
A plus | Barclays
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments   11.6
Collertal provided to counterparty in cash   0
Collateral provided to counterparty in financial instruments   0
Net amount of exposure after effect of collateral   11.6
Excess collateral provided to counterparty in cash   0
Derivative, Collateral, Right to Reclaim Securities   0
Counter-party collateral held by WMLife Re - Cash   0
Net amount of exposure to counter-party   11.6
A plus | JP Morgan
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments 12.5 (22.8)
Collertal provided to counterparty in cash 0 22.8
Collateral provided to counterparty in financial instruments 0 0
Net amount of exposure after effect of collateral 12.5 0
Excess collateral provided to counterparty in cash 19.4 32.8
Derivative, Collateral, Right to Reclaim Securities 0 0
Counter-party collateral held by WMLife Re - Cash 0 0
Net amount of exposure to counter-party 31.9 32.8
Standard & Poor's, BBB+ Rating [Member] | Nomura [Member]
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments (4.3) (0.9)
Collertal provided to counterparty in cash 3.6 0.9
Collateral provided to counterparty in financial instruments 0.70 0
Net amount of exposure after effect of collateral 0 0
Excess collateral provided to counterparty in cash 0 0.8
Derivative, Collateral, Right to Reclaim Securities 23.8 28.0
Counter-party collateral held by WMLife Re - Cash 0 0
Net amount of exposure to counter-party 23.8 28.8
A- | Goldman Sachs
    
Credit risk on derivative instruments    
Excess collateral provided - Financial Instruments 0 (0.1)
Collertal provided to counterparty in cash 0 0.1
Collateral provided to counterparty in financial instruments 0 0
Net amount of exposure after effect of collateral 0 0
Excess collateral provided to counterparty in cash 0 3.1
Derivative, Collateral, Right to Reclaim Securities 0 0
Counter-party collateral held by WMLife Re - Cash 0 0
Net amount of exposure to counter-party $ 0 $ 3.1
[1] All derivative instruments held by WM Life Re are subject to master netting arrangements.