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Employee Share-Based Incentive Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of performance share activity | The following table summarizes performance share activity for the three months ended March 31, 2013 and 2012 for performance shares granted under the WTM Incentive Plan and phantom performance shares granted under the Sirius Group Performance Plan (the “WTM Phantom Share Plan”):
|  | Three Months Ended March 31,
|  | 2013 |  | 2012
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 119,357 |  |  | $ | 29.4 |  |  | 150,064 |  |  | $ | 66.1 |
Shares paid (1) |  | (47,310 | ) |  | (11.0 | ) |  | (68,357 | ) |  | (48.4 | )
New grants |  | 46,920 |  |  | — |  |  | 35,932 |  |  | — |
Assumed forfeitures and cancellations (2) |  | 9 |  |  | .1 |  |  | 811 |  |  | 1.0 |
Expense recognized |  | — |  |  | 10.1 |  |  | — |  |  | 8.7 |
Ending March 31, |  | 118,976 |  |  | $ | 28.6 |  |  | 118,450 |  |  | $ | 27.4 |
(1) WTM performance share payments in 2013 for the 2010-2012 performance cycle ranged from 33% to 98% of target. WTM performance share payments in 2012 for the 2009-2011 performance cycle ranged from 147% to 155% of target. (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 March 31, 2013 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2013 – 2015 |  | 46,920 |  |  | $ | 2.2 |
2012 – 2014 |  | 37,977 |  |  | 11.4 |
2011 – 2013 |  | 37,130 |  |  | 15.8 |
Sub-total |  | 122,027 |  |  | 29.4 |
Assumed forfeitures |  | (3,051 | ) |  | (.8 | )
Total at March 31, 2013 |  | 118,976 |  |  | $ | 28.6 |
Summary of restricted share activity | The following outlines the unrecognized compensation cost associated with the outstanding restricted share awards for the three months ended March 31, 2013 and 2012:
|  | Three Months Ended March 31,
|  | 2013 |  | 2012
Millions, except share amounts |  | Restricted Shares |  | Unamortized Issue Date Fair Value |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  | 69,910 |  |  | $ | 16.8 |  |  | 72,000 |  |  | $ | 13.3 |
Issued |  | 25,470 |  |  | 14.3 |  |  | 28,460 |  |  | 13.7 |
Vested |  | — |  |  | — |  |  | (7,000 | ) |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (2.9 | ) |  | — |  |  | (2.5 | )
Non-vested at March 31, |  | 95,380 |  |  | $ | 28.2 |  |  | 93,460 |  |  | $ | 24.5 |
Summary of performance share activity for OneBeacon performance shares granted under OneBeacon Incentive Plan | The following table summarizes performance share activity for the three months ended March 31, 2013 and 2012 for OneBeacon performance shares granted under the OneBeacon Incentive Plan:
|  | Three Months Ended March 31,
|  | 2013 |  | 2012
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 563,190 |  |  | $ | 1.2 |  |  | 642,667 |  |  | $ | 9.7 |
Shares paid or expired (1) |  | (238,658 | ) |  | — |  |  | (249,733 | ) |  | (7.5 | )
New awards |  | 179,000 |  |  | — |  |  | 181,290 |  |  | — |
Assumed forfeitures and cancellations (2) |  | (13,665 | ) |  | — |  |  | (4,479 | ) |  | — |
Expense recognized |  | — |  |  | .4 |  |  | — |  |  | 1.0 |
Ending March 31, |  | 489,867 |  |  | $ | 1.6 |  |  | 569,745 |  |  | $ | 3.2 |
(1) There were no payments made in 2013 for the 2010-2012 performance cycle; those performance shares did not meet the threshold performance goals and expired. OneBeacon performance share payments in 2012 for the 2009-2011 performance cycle were at 138.6% of target. Amounts include deposits into OneBeacon’s deferred compensation plan. (2) 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 table summarizes OneBeacon performance shares outstanding awarded under the OneBeacon Incentive Plan at March 31, 2013 for each performance cycle:
Millions, except share amounts |  | Target OneBeacon Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2013 – 2015 |  | 179,000 |  |  | $ | .2 |
2012 – 2014 |  | 181,290 |  |  | 1.1 |
2011 – 2013 |  | 142,138 |  |  | .3 |
Sub-total |  | 502,428 |  |  | 1.6 |
Assumed forfeitures |  | (12,561 | ) |  | — |
Total at March 31, 2013 |  | 489,867 |  |  | $ | 1.6 |
Summary of OneBeacon restricted shares activity | The following summarizes the unrecognized compensation cost associated with the outstanding OneBeacon restricted share awards for the three months ended March 31, 2013 and 2012:
|  | Three Months Ended March 31,
|  | 2013 |  | 2012
Millions, except share amounts |  | Restricted Shares |  | Unamortized Issue Date Fair Value |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  | 927,000 |  |  | $ | 9.6 |  |  | 630,000 |  |  | $ | 7.7 |
Issued |  | — |  |  | — |  |  | 300,000 |  |  | 4.6 |
Vested |  | (9,000 | ) |  | — |  |  | — |  |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (.8 | ) |  | — |  |  | (.4 | )
Non-vested at March 31, |  | 918,000 |  |  | $ | 8.8 |  |  | 930,000 |  |  | $ | 11.9 |

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