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Derivatives (Level 3 Derivative Instruments) (Details) - White Mountains Life Re
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Discounted cash flows  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Fair value Liabilities $ (0.1)
Variable annuity benefit guarantee liabilities | Discounted cash flows | Minimum  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Mortality (as a percent) 0.00%
Variable annuity benefit guarantee liabilities | Discounted cash flows | Maximum  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Mortality (as a percent) 6.40%
Variable annuity benefit guarantee liabilities | Discounted cash flows | Weighted Average  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Mortality (as a percent) 1.10%
Foreign Exchange Option [Member] | Counterparty valuations  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Fair value Liabilities $ (1.1)
Foreign Exchange Option [Member] | Counterparty valuations | Minimum  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Foreign exchange volatilities (as a percent) (4.30%)
Foreign Exchange Option [Member] | Counterparty valuations | Maximum  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Foreign exchange volatilities (as a percent) (7.30%)
Foreign Exchange Option [Member] | Counterparty valuations | Weighted Average  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Foreign exchange volatilities (as a percent) (5.90%)
Equity Index Options | Counterparty valuations  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Fair value Liabilities $ (1.5)
Equity Index Options | Counterparty valuations | Minimum  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Expected equity dividends (as a percent) (0.60%)
Equity Index Options | Counterparty valuations | Maximum  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Expected equity dividends (as a percent) (5.70%)
Equity Index Options | Counterparty valuations | Weighted Average  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Expected equity dividends (as a percent) (5.60%)
Year One | Variable annuity benefit guarantee liabilities | Discounted cash flows | Minimum  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Surrenders (as a percent) 0.10%
Foreign exchange volatilities (as a percent) 12.00%
Index volatilities (as a percent) 25.50%
Year One | Variable annuity benefit guarantee liabilities | Discounted cash flows | Maximum  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Surrenders (as a percent) 40.00%
Foreign exchange volatilities (as a percent) 18.40%
Index volatilities (as a percent) 28.80%
Year One | Variable annuity benefit guarantee liabilities | Discounted cash flows | Weighted Average  
Quantitative information for Level 3 Fair Value Measurements Liabilities  
Surrenders (as a percent) 40.00%
Foreign exchange volatilities (as a percent) 13.50%
Index volatilities (as a percent) 26.20%