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SCHEDULE II CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT (Details) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
White Mountains Insurance Group Ltd.
Dec. 31, 2011
White Mountains Insurance Group Ltd.
Dec. 31, 2010
White Mountains Insurance Group Ltd.
Nov. 30, 2011
Lone Tree Insurance Group Ltd [Member]
Dec. 31, 2012
White Mountains excluding noncontrolling interest [Member]
Dec. 31, 2011
White Mountains excluding noncontrolling interest [Member]
Nov. 30, 2011
Fixed maturity investments
Lone Tree Insurance Group Ltd [Member]
Nov. 30, 2011
Short-term investments
Lone Tree Insurance Group Ltd [Member]
CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT                      
Payments to subsidiaries       $ (663,000,000) [1] $ 0 [1] $ 0 [1]          
Assets:                      
Cash 462,400,000 705,400,000           500,000 700,000    
Fixed maturity investments, at fair value 5,196,200,000 6,221,900,000           39,000,000 [2],[3] 1,334,500,000 [2],[3]    
Common equity securities, at fair value 1,029,700,000 755,000,000           0 1,900,000    
Short-term investments, at amortized cost (2) 630,600,000 846,000,000           8,900,000 [2] 72,300,000 [2]    
Receivable due from subsidiaries               96,600,000 [2] 2,800,000 [2]    
Other assets 503,000,000 681,900,000           1,000,000 5,100,000    
Investments in consolidated and unconsolidated affiliates               3,664,600,000 [3],[4] 2,687,300,000 [3],[4]    
Total assets 12,895,400,000 14,064,000,000           3,810,600,000 4,104,600,000    
Liabilities                      
Debt 751,200,000 677,500,000           75,000,000 0    
Accounts payable and other liabilities 452,800,000 527,800,000           3,800,000 16,900,000    
Total liabilities 8,637,200,000 9,396,100,000           78,800,000 16,900,000    
Total White Mountains’ common shareholders’ equity 3,731,800,000 4,087,700,000           3,731,800,000 4,087,700,000    
Total liabilities and equity 12,895,400,000 14,064,000,000           3,810,600,000 [4] 4,104,600,000 [4]    
Common shares repurchased and retired during the period 1,329,640 646,502 687,871                
Stock Repurchased and Retired During Period, Value 669,100,000 253,000,000 225,500,000                
Noncash investments acquired                   0 284.7
Noncash payables acquired             $ 417.5        
[1] During 2012, the Company sold the majority of its fixed maturity investments and used the proceeds to (a) contribute $663.0 to its subsidiaries, the majority of which was used to fund HG Global and (b) repurchase 1,329,640 of its common shares for $669.1
[2] (2) In November 2011, Lone Tree Insurance Group Ltd., a direct wholly-owned subsidiary of the Registrant, was liquidated into the Registrant. Significant non-cash balances that were transferred to the Registrant as part of the liquidation included fixed maturity investments of $1,146.9, short-term investments of $284.7 and a payable to subsidiary of $417.5.
[3] (1) During 2012, the Company sold the majority of its fixed maturity investments and used the proceeds to (a) contribute $663.0 to its subsidiaries, the majority of which was used to fund HG Global and (b) repurchase 1,329,640 of its common shares for $669.1.
[4] (3) In 2011, the Company revised the presentation of investments in consolidated and unconsolidated affiliates, total liabilities and equity and equity in earnings (losses) from consolidated and unconsolidated affiliates to be net of non-controlling interests for all periods presented.