XML 138 R118.htm IDEA: XBRL DOCUMENT v3.3.1.900
Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Net income (loss) attributable to White Mountains’ common shareholders                 $ 198.8 $ 53.6 $ 175.1
Basic and diluted earnings per share numerators (in millions):                      
Allocation of income for unvested restricted common shares(1)                 (2.3) (0.7) (2.6)
Dividends declared on participating restricted common shares(1)                 (0.1) (0.1) (0.1)
Total allocation to restricted common shares                 (2.4) (0.8) (2.7)
Net income attributable to White Mountains’s common shareholders, net of restricted common share amounts                 196.4 52.8 172.4
Undistributed net earnings (in millions):                      
Net income attributable to White Mountains’s common shareholders, net of restricted common share amounts                 196.4 52.8 172.4
Dividends declared net of restricted common share amounts(1)                 (5.9) (6.1) (6.1)
Total undistributed net earnings, net of restricted common share amounts                 $ 190.5 $ 46.7 $ 166.3
Basic earnings per share denominators (in thousands):                      
Total average common shares outstanding during the period                 5,879,200 6,104,900 6,200,400
Average unvested restricted common shares                 (68,000) (78,900) (91,400)
Basic earnings per share denominator                 5,811,200 6,026,000 6,109,000
Diluted earnings per share denominator (in thousands):                      
Total average common shares outstanding during the period                 5,879,200 6,104,900 6,200,400
Average unvested restricted common shares                 (68,000) (78,900) (91,400)
Average outstanding dilutive options to acquire common shares                 0 0 0
Diluted earnings (loss) per share denominator                 5,811,200 6,026,000 6,109,000
Basic earnings per share (in dollars):                      
Net income attributable to White Mountains’s common shareholders $ 45.99 $ (12.42) $ 0.13 $ 1.76 $ (2.03) $ (2.07) $ 5.58 $ 7.13 $ 33.80 $ 8.77 $ 28.22
Dividends declared and paid                 (1.00) (1.00) (1.00)
Undistributed earnings                 32.80 7.77 27.22
Diluted earnings per share (in dollars)                      
Net income attributable to White Mountains’s common shareholders $ 45.96 $ (12.42) $ 0.13 $ 1.76 $ (2.03) $ (2.07) $ 5.58 $ 7.13 33.80 8.77 28.22
Dividends declared and paid                 (1.00) (1.00) (1.00)
Undistributed earnings                 $ 32.80 $ 7.77 $ 27.22
Incremental common shares attributable to share-based payment arrangements                 125,000 125,000 125,000