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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Millions
Total
White Mountains' Common Shareholders' Equity
Common shares and paid-in surplus
Retained earnings
Accum. other comprehensive income (loss), after-tax
Non-controlling interest
Balances at Dec. 31, 2009 $ 3,657.4$ 1,445.0$ 2,215.9$ (3.5)$ 684.1
Increase (Decrease) in Stockholders' Equity      
Cumulative effect adjustment - ASU 2009-17 (ASU 2009-17) (0.4) (0.4) (22.8)
Tax basis change due to intercompany transfer (10.4) (4.4)(6.0) 
Net (loss) income50.013.6 13.6 36.4
Other comprehensive income, after-tax 172.3  172.3 
Dividends declared on common shares(8.8)(8.8) (8.8)  
Dividends to noncontrolling interests     (80.5)
Repurchases and retirements of common shares (178.2)(88.2)(90.0)  
Issuances of common shares 0.80.8   
Net distributions to noncontrolling interests     (13.5)
Amortization of restricted share and option awards 21.521.5  0.1
Balances at Sep. 30, 2010 3,667.81,379.12,125.9162.8603.8
Balances at Dec. 31, 20104,260.83,653.01,359.02,175.6118.4607.8
Increase (Decrease) in Stockholders' Equity      
Net (loss) income(11.1)(32.3) (32.3) 21.2
Other comprehensive income, after-tax 52.0  52.0 
Dividends declared on common shares(8.0)(8.0) (8.0)  
Dividends to noncontrolling interests     (47.2)
Repurchases and retirements of common shares (229.8)(98.5)(131.3)  
Issuances of common shares 0.90.9   
Net distributions to noncontrolling interests     (7.7)
Amortization of restricted share and option awards 8.98.9  0.3
Balances at Sep. 30, 2011$ 4,019.1$ 3,444.7$ 1,270.3$ 2,004.0$ 170.4$ 574.4