XML 15 R55.htm IDEA: XBRL DOCUMENT v2.4.0.6
Earnings (Loss) Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Basic and diluted earnings per share numerators (in millions):    
Net income (loss) attributable to White Mountains' common shareholders $ 93.7 $ (30.7)
Allocation of income for participating unvested restricted common shares (1.0) 0.2
Dividends declared on participating restricted common shares (0.1) (0.1)
Total allocation to restricted common shares (1.1) 0.1
Net income (loss) attributable to White Mountains' common shareholders, net of restricted share amounts 92.6 (30.6)
Undistributed net earnings (in millions):    
Net income (loss) attributable to White Mountains' common shareholders, net of restricted common share amounts 92.6 (30.6)
Dividends declared net of restricted common share amounts (6.6) (7.9)
Total undistributed net earnings (loss), net of restricted common share amounts $ 86.0 $ (38.5)
Basic earnings per share denominators (in thousands):    
Total average common shares outstanding during the period 7,431,700 8,031,800
Average unvested restricted common shares (78,300) (57,100)
Basic earnings (loss) per share denominator 7,353,400 7,974,700
Diluted earnings per share denominator (in thousands):    
Total average common shares outstanding during the period 7,431,700 8,031,800
Average unvested restricted common shares (78,300) (57,100)
Diluted earnings (loss) per share denominator 7,353,400 7,974,700
Basic earnings per share (in dollars):    
Net income (loss) attributable to White Mountains' common shareholders $ 12.59 $ (3.82)
Dividends declared (in dollars per share) $ (1.00) $ (1.00)
Undistributed earnings (loss) (in dollars per share) $ 11.59 $ (4.82)
Diluted earnings per share (in dollars)    
Net income (loss) attributable to White Mountains' common shareholders (in dollars per share) $ 12.59 $ (3.82)
Dividends declared (in dollars per share) $ (1.00) $ (1.00)
Undistributed earnings (loss) (in dollars per share) $ 11.59 $ (4.82)