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SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - CONDENSED BALANCE SHEETS (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets    
Common equity securities, at fair value $ 538.4 $ 668.4
Other long-term investments 1,998.2 1,488.0
Total assets 8,385.9 7,389.3
Liabilities    
Total liabilities 3,824.3 3,454.3
Total White Mountains’s common shareholders’ equity 4,240.5 3,746.9
Total liabilities and equity 8,385.9 7,389.3
White Mountains Insurance Group Ltd.    
Assets    
Cash 0.3 0.1
Fixed maturity investments, at fair value 0.0 49.2
Common equity securities, at fair value 147.8 342.8
Short-term investments, at fair value 198.8 105.2
Other long-term investments 160.5 49.3
Net receivable due from subsidiaries 89.1 125.2
Other assets 4.0 75.3
Investments in consolidated subsidiaries 3,666.9 3,027.2
Total assets 4,267.4 3,774.3
Liabilities    
Other liabilities 26.9 27.4
Total liabilities 26.9 27.4
Total White Mountains’s common shareholders’ equity 4,240.5 3,746.9
Total liabilities and equity $ 4,267.4 $ 3,774.3