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SCHEDULE II CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT (Details 3) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Nov. 30, 2011
Lone Tree Insurance Group Ltd [Member]
Dec. 31, 2012
White Mountains Insurance Group Ltd.
Dec. 31, 2011
White Mountains Insurance Group Ltd.
Dec. 31, 2010
White Mountains Insurance Group Ltd.
Dec. 31, 2009
White Mountains Insurance Group Ltd.
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                                      
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                
Net Income (Loss) Available to Common Stockholders, Basic 68,200,000 19,100,000 26,100,000 94,000,000 800,200,000 (15,800,000) 11,700,000 (28,200,000) 207,400,000 767,900,000 86,500,000     207,400,000 [1] 767,900,000 [1] 86,500,000 [1]      
Charges (credits) to reconcile net income to net cash (used for) provided from operations:                                      
Net realized and unrealized investment gains                 (118,200,000) (74,100,000) (77,600,000)     (11,000,000) (3,100,000) 100,000      
Undistributed current (earnings) losses from subsidiaries                           (219,300,000) [1] (806,700,000) [1] (128,200,000) [1]      
Net federal income tax (payments) receipts                 17,500,000 12,500,000 (47,000,000)                
Net change in other assets and liabilities, net                 151,000,000 (229,000,000) (89,500,000)     12,100,000 13,700,000 27,900,000      
Net cash (used for) provided from operations                 (225,800,000) (114,500,000) 56,000,000     (10,800,000) (28,200,000) (13,700,000)      
Cash flows from investing activities:                                      
Net decrease in short-term investments                 145,300,000 174,500,000 475,600,000     63,300,000 [2] 267,300,000 [2] 166,500,000 [2]      
Purchases of investment securities                           (706,200,000) [2] (237,300,000) [2] (5,800,000) [2]      
Sales and maturities of investment securities                           2,009,700,000 [3] 59,000,000 [3] 0 [3]      
Issuance of debt (to) from subsidiaries                           (121,000,000) 0 86,800,000      
Repayment of debt (to) from subsidiaries                           28,500,000 [2] 192,500,000 [2] 0 [2]      
Payments to subsidiaries                           (663,000,000) [3] 0 [3] 0 [3]      
Distributions from subsidiaries                           0 7,200,000 0      
Net change in unsettled investment purchases and sales                 (22,400,000) 47,000,000 1,600,000                
Net cash provided from investing activities                 829,600,000 799,600,000 485,300,000     611,300,000 288,700,000 247,500,000      
Draw down of revolving line of credit                 150,000,000 0 0     150,000,000 0 0      
Cash flows from financing activities:                                      
Repayment of debt                 (75,000,000) 0 (14,000,000)     (75,000,000) 0 0      
Proceeds from issuances of common shares                 0 900,000 700,000     0 900,000 700,000      
Repurchases and retirement of common shares                 (669,100,000) (253,000,000) (225,600,000)     (669,100,000) [3] (253,000,000) [3] (225,600,000) [3]      
Dividends paid on common shares                 (6,600,000) (8,000,000) (8,800,000)     (6,600,000) (8,000,000) (8,800,000)      
Net cash used for financing activities                 (648,200,000) (460,200,000) (550,200,000)     (600,700,000) (260,100,000) (233,700,000)      
Net change in cash during the period                 (41,300,000) 223,400,000 (800,000)     (200,000) 400,000 100,000      
Cash balance at beginning of year 212,600,000       251,900,000       212,600,000 251,900,000 103,600,000 119,900,000   500,000 700,000 300,000 200,000    
Cash balance at end of year 212,600,000       251,900,000       212,600,000 251,900,000 103,600,000 119,900,000   500,000 700,000 300,000 200,000    
Noncash investments acquired                                   0 284.7
Noncash payables acquired                         $ 417.5            
[1] n 2011, the Company revised the presentation of net income attributable to White Mountains’ common shareholders and undistributed current earnings from subsidiaries to be net of non-controlling interests for all periods presented.
[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] 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