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Employee Share-Based Incentive Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of performance share activity | The following summarizes performance share activity for the years ended December 31, 2012, 2011 and 2010 for performance shares granted under the WTM Incentive Plan and the WTM Phantom Share Plan:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 150,064 |  |  | $ | 66.1 |  |  | 163,184 |  |  | $ | 29.4 |  |  | 172,454 |  |  | $ | 12.2 |
Shares paid or expired (1) |  | (68,357 | ) |  | (58.3 | ) |  | (51,131 | ) |  | — |  |  | (49,127 | ) |  | — |
New grants |  | 38,432 |  |  | — |  |  | 37,675 |  |  | — |  |  | 47,880 |  |  | — |
Assumed forfeitures and cancellations (2) |  | (782 | ) |  | .6 |  |  | 336 |  |  | (.9 | ) |  | (8,023 | ) |  | (.7 | )
Expense recognized |  | — |  |  | 21.0 |  |  | — |  |  | 37.6 |  |  | — |  |  | 17.9 |
Ending December 31, |  | 119,357 |  |  | $ | 29.4 |  |  | 150,064 |  |  | $ | 66.1 |  |  | 163,184 |  |  | $ | 29.4 |
(1) | WTM performance share payments in 2012 for the 2009-2011 performance cycle ranged from 147% to 155% of target. At December 31, 2012, White Mountains paid $9.9 as a partial payment for the 2010-2012 performance cycle. There were no payments made in 2011 and 2010 for the 2008-2010 and 2007-2009 performance cycles; those performance shares did not meet the threshold performance goals and expired.
(2) | Amounts include changes in assumed forfeitures, as required under GAAP.
Summary of performance shares outstanding and accrued expense for performance shares awarded under the WTM Incentive Plan | The following table summarizes performance shares outstanding and accrued expense for performance shares awarded under the WTM Incentive Plan at December 31, 2012 for each performance cycle:
Millions, except share amounts |  | Target WTM Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2012 – 2014 |  | 37,977 |  |  | $ | 7.6 |
2011 – 2013 |  | 37,130 |  |  | 12.7 |
2010 – 2012 |  | 42,320 |  |  | 7.3 |
Sub-total |  | 117,427 |  |  | 27.6 |
Assumed forfeitures |  | (2,935 | ) |  | (.8 | )
Total at December 31, 2012 |  | 114,492 |  |  | $ | 26.8 |
Summary of performance shares outstanding and accrued expense for performance shares awarded under the Phantom Plan | The following summarizes phantom performance shares outstanding and accrued expense for awards made under the WTM Phantom Share Plan at December 31, 2012 for each performance cycle:
Millions, except share amounts |  | Target WTM Phantom Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2012 – 2014 (1) |  | — |  |  | $ | — |
2011 – 2013 (1) |  | — |  |  | — |
2010 – 2012 |  | 4,990 |  |  | 2.6 |
Sub-total |  | 4,990 |  |  | 2.6 |
Assumed forfeitures |  | (125 | ) |  | — |
Total at December 31, 2012 |  | 4,865 |  |  | $ | 2.6 |
(1) All performance shares for the 2011–2013 and 2012–2014 performance cycles were granted from the WTM Incentive Plan.
Summary of restricted share activity | The following outlines the unrecognized compensation cost associated with the outstanding restricted share awards under the WTM Incentive Plan for the years ended December 31, 2012, 2011 and 2010:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Millions, except share amounts |  | Restricted Shares | Unamortized Issue Date Fair Value |  | Restricted Shares | Unamortized Issue Date Fair Value |  | Restricted Shares | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |
Beginning of period |  | 72,000 |  | $ | 13.3 |  |  | 46,250 |  | $ | 14.1 |  |  | 91,900 |  | $ | 23.7 |
Issued |  | 32,160 |  | 15.7 |  |  | 27,250 |  | 9.9 |  |  | 19,750 |  | 6.7 |
Vested |  | (32,945 | ) | — |  |  | (1,500 | ) | — |  |  | (65,150 | ) | — |
Forfeited |  | (1,305 | ) | (.2 | ) |  | — |  | — |  |  | (250 | ) | (.1 | )
Modified (1) |  | — |  | — |  |  | — |  | — |  |  | — |  | (3.3 | )
Expense recognized |  | — |  | (12.0 | ) |  | — |  | (10.7 | ) |  | — |  | (12.9 | )
Non-vested at December 31, |  | 69,910 |  | $ | 16.8 |  |  | 72,000 |  | $ | 13.3 |  |  | 46,250 |  | $ | 14.1 |
(1) | During the first quarter of 2007, White Mountains issued 15,000 restricted shares to the Company’s Chairman and CEO in connection with his hiring that would vest in the event of a change in control of the Company before January 20, 2012. During 2010, the Compensation Committee modified the vesting terms so that the 15,000 restricted shares time vest in three equal annual installments beginning on January 20, 2013. During 2012, the Compensation Committee accelerated the vesting date of the first installment from January 20, 2013 to December 31, 2012.
Schedule of summarized activity for the years | The following summarizes activity for the years ended December 31, 2012, 2011 and 2010 for OneBeacon performance shares granted under the OneBeacon Incentive Plan:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 642,667 |  |  | $ | 9.7 |  |  | 1,464,295 |  |  | $ | 18.5 |  |  | 2,224,215 |  |  | $ | 15.1 |
Payments and deferrals (1)(2) |  | (258,901 | ) |  | (7.7 | ) |  | (936,150 | ) |  | (10.5 | ) |  | (889,594 | ) |  | (4.6 | )
New awards |  | 181,290 |  |  | — |  |  | 194,900 |  |  | — |  |  | 270,691 |  |  | — |
Forfeitures and cancellations (3) |  | (1,866 | ) |  | — |  |  | (80,378 | ) |  | (.5 | ) |  | (141,017 | ) |  | (2.2 | )
Expense recognized |  | — |  |  | (.8 | ) |  | — |  |  | 2.2 |  |  | — |  |  | 10.2 |
End of period |  | 563,190 |  |  | $ | 1.2 |  |  | 642,667 |  |  | $ | 9.7 |  |  | 1,464,295 |  |  | $ | 18.5 |
(1) OneBeacon performance share payments in 2012 for the 2009-2011 performance cycle were at 138.6% of target. OneBeacon performance shares payments in 2011 for the 2008-2010 performance cycle were at 68.5% of target. OneBeacon performance share payments in 2010 for the 2007-2009 performance cycle were at 14.2% of target. Amounts include deposits into OneBeacon’s deferred compensation plan. (2) OneBeacon performance share payments in 2010 also include accelerated payments resulting from the OneBeacon Personal Lines and Commercial Lines Transactions to employees of those businesses. The accelerated OneBeacon performance shares payments for the 2009-2011 and 2010-2012 performance cycles were on a pro rata basis and at a performance factor of 100%. (3) Amounts include changes in assumed forfeitures, as required under GAAP.
Summary of OneBeacon performance shares outstanding and accrued expense for OneBeacon performance shares awarded under the OneBeacon Incentive Plan | The following summarizes OneBeacon performance shares outstanding awarded under the OneBeacon Incentive Plan at December 31, 2012 for each performance cycle:
Millions, except share amounts |  | Target OneBeacon Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2012 – 2014 |  | 181,290 |  |  | $ | .9 |
2011 – 2013 |  | 151,563 |  |  | .3 |
2010 – 2012 |  | 238,658 |  |  | — |
Sub-total |  | 571,511 |  |  | 1.2 |
Assumed forfeitures |  | (8,321 | ) |  | — |
Total at December 31, 2012 |  | 563,190 |  |  | $ | 1.2 |
Schedule of summarized unrecognized compensation cost | The following table summarizes the unrecognized compensation cost associated with the outstanding OneBeacon restricted stock awards for the years ended December 31, 2012 and 2011.
|  | Year ended December 31,
|  | 2012 |  | 2011
Millions, except share amounts |  | Restricted Shares |  | Unamortized Issue Date Fair Value |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |
Beginning of period |  | 630,000 |  |  | $ | 7.7 |  |  | — |  |  | $ | — |
Issued |  | 300,000 |  |  | 4.5 |  |  | 630,000 |  |  | 8.6 |
Vested |  | (667 | ) |  | — |  |  | — |  |  | — |
Forfeited |  | (2,333 | ) |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (2.6 | ) |  | — |  |  | (.9 | )
End of period |  | 927,000 |  |  | $ | 9.6 |  |  | 630,000 |  |  | $ | 7.7 |
Summary of stock option activity | The following table summarizes option activity for the years ended December 31, 2012, 2011 and 2010:
|  | Year ended December 31,
|  | 2012 |  | 2011 |  | 2010
Millions |  | Target Outstanding Options |  | Expense Recognized |  | Target Outstanding Options |  | Expense Recognized |  | Target Outstanding Options |  | Expense Recognized
Beginning of period |  | 740,870 |  |  | $ | — |  |  | 768,652 |  |  | $ | — |  |  | 1,015,610 |  |  | $ | — |
New awards |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeitures |  | — |  |  | — |  |  | (27,782 | ) |  | — |  |  | (37,044 | ) |  | — |
Vested and expired (1) |  | (740,870 | ) |  | — |  |  | — |  |  | — |  |  | (209,914 | ) |  | — |
Exercised |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | — |  |  | — |  |  | .5 |  |  | — |  |  | .9 |
End of period |  | — |  |  | $ | — |  |  | 740,870 |  |  | $ | .5 |  |  | 768,652 |  |  | $ | .9 |
(1) | During the year ended December 31, 2010, as a result of the Commercial Lines Transaction and Personal Lines Transaction, 209,914 options vested that were unexercised and expired. All remaining options expired in May 2012.

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