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Employee Share-Based Incentive Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of performance share activity | The following table summarizes performance share activity for the three and nine months ended September 30, 2012 and 2011 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 September 30, |  | Nine Months Ended September 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 118,450 |  |  | $ | 32.7 |  |  | 150,064 |  |  | $ | 56.5 |  |  | 150,064 |  |  | $ | 66.1 |  |  | 163,184 |  |  | $ | 29.4 |
Shares paid or expired (1) |  | — |  |  | — |  |  | — |  |  | — |  |  | (68,357 | ) |  | (48.4 | ) |  | (51,131 | ) |  | — |
New grants |  | 2,500 |  |  | — |  |  | — |  |  | — |  |  | 38,432 |  |  | — |  |  | 37,675 |  |  | — |
Assumed forfeitures and cancellations (2) |  | (1,359 | ) |  | (.4 | ) |  | — |  |  | — |  |  | (548 | ) |  | .4 |  |  | 336 |  |  | (.6 | )
Expense recognized |  | — |  |  | 6.6 |  |  | — |  |  | (1.0 | ) |  | — |  |  | 20.8 |  |  | — |  |  | 26.7 |
Ending September 30, |  | 119,591 |  |  | $ | 38.9 |  |  | 150,064 |  |  | $ | 55.5 |  |  | 119,591 |  |  | $ | 38.9 |  |  | 150,064 |  |  | $ | 55.5 |
(1) WTM performance share payments in 2012 for the 2009-2011 performance cycle ranged from 147% to 155% of target. There were no payments made in 2011 for the 2008-2010 performance cycle; 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 September 30, 2012 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2010 – 2012 |  | 42,320 |  |  | $ | 19.0 |
2011 – 2013 |  | 37,255 |  |  | 12.9 |
2012 – 2014 |  | 38,092 |  |  | 5.4 |
Sub-total |  | 117,667 |  |  | 37.3 |
Assumed forfeitures |  | (2,941 | ) |  | (1.0 | )
Total at September 30, 2012 |  | 114,726 |  |  | $ | 36.3 |
Summary of performance shares outstanding and accrued expense for performance shares awarded under the Phantom Plan | The following table summarizes phantom performance shares outstanding and accrued expense for grants made under WTM Phantom Share Plan at September 30, 2012 for each performance cycle:
Millions, except share amounts |  | Target WTM Phantom Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2010 – 2012 |  | 4,990 |  |  | $ | 2.7 |
2011 – 2013 (1) |  | — |  |  | — |
2012 – 2014 (1) |  | — |  |  | — |
Sub-total |  | 4,990 |  |  | 2.7 |
Assumed forfeitures |  | (125 | ) |  | (.1 | )
Total at September 30, 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 for the three and nine months ended September 30, 2012 and 2011:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
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 |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  | 93,460 |  |  | $ | 21.5 |  |  | 73,500 |  |  | $ | 18.9 |  |  | 72,000 |  |  | $ | 13.3 |  |  | 46,250 |  |  | $ | 14.1 |
Issued |  | 3,700 |  |  | 2.0 |  |  | — |  |  | — |  |  | 32,160 |  |  | 15.7 |  |  | 27,250 |  |  | 9.9 |
Vested |  | — |  |  | — |  |  | — |  |  | — |  |  | (7,000 | ) |  | — |  |  | — |  |  | — |
Forfeited |  | (1,065 | ) |  | (.2 | ) |  | — |  |  | — |  |  | (1,065 | ) |  | (.2 | ) |  | — |  |  | — |
Expense recognized |  | — |  |  | (3.2 | ) |  | — |  |  | (2.8 | ) |  | — |  |  | (8.7 | ) |  | — |  |  | (7.9 | )
Non-vested at September 30, |  | 96,095 |  |  | $ | 20.1 |  |  | 73,500 |  |  | $ | 16.1 |  |  | 96,095 |  |  | $ | 20.1 |  |  | 73,500 |  |  | $ | 16.1 |
Summary of performance share activity for OneBeacon performance shares granted under OneBeacon Incentive Plan | The following table summarizes performance share activity for the three and nine months ended September 30, 2012 and 2011 for OneBeacon performance shares granted under the OneBeacon Incentive Plan:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 560,577 |  |  | $ | 3.1 |  |  | 671,727 |  |  | $ | 10.0 |  |  | 642,667 |  |  | $ | 9.7 |  |  | 1,464,295 |  |  | $ | 18.5 |
Payments and deferrals (1)(2) |  | — |  |  | — |  |  | — |  |  | — |  |  | (258,901 | ) |  | (7.8 | ) |  | (936,150 | ) |  | (10.5 | )
New awards |  | — |  |  | — |  |  | — |  |  | — |  |  | 181,290 |  |  | — |  |  | 194,900 |  |  | — |
Assumed forfeitures and cancellations (3) |  | (3,354 | ) |  | — |  |  | (19,583 | ) |  | .1 |  |  | (7,833 | ) |  | — |  |  | (70,901 | ) |  | (.2 | )
Expense recognized |  | — |  |  | (2.2 | ) |  | — |  |  | (.5 | ) |  | — |  |  | (1.0 | ) |  | — |  |  | 1.8 |
Ending September 30, |  | 557,223 |  |  | $ | .9 |  |  | 652,144 |  |  | $ | 9.6 |  |  | 557,223 |  |  | $ | .9 |  |  | 652,144 |  |  | $ | 9.6 |
(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. Amounts include deposits into OneBeacon’s deferred compensation plan. (2) OneBeacon performance share payments also include accelerated payments resulting from the OneBeacon Personal Lines and Commercial Lines Transactions. 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 table summarizes OneBeacon performance shares outstanding awarded under the OneBeacon Incentive Plan at September 30, 2012 for each performance cycle:
Millions, except share amounts |  | Target OneBeacon Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2010 – 2012 |  | 238,658 |  |  | $ | — |
2011 – 2013 |  | 151,563 |  |  | .4 |
2012 – 2014 |  | 181,290 |  |  | .5 |
Sub-total |  | 571,511 |  |  | .9 |
Assumed forfeitures |  | (14,288 | ) |  | — |
Total at September 30, 2012 |  | 557,223 |  |  | $ | .9 |
Summary of OneBeacon Restricted Shares activity | The following outlines the unrecognized compensation cost associated with the outstanding restricted share awards for the three and nine months ended September 30, 2012:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
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 |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  | 930,000 |  |  | $ | 11.2 |  |  | 630,000 |  |  | $ | 8.5 |  |  | 630,000 |  |  | $ | 7.7 |  |  | 630,000 |  |  | $ | 8.6 |
Issued |  | — |  |  | — |  |  | — |  |  | — |  |  | 300,000 |  |  | 4.6 |  |  | — |  |  | — |
Vested |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (.8 | ) |  | — |  |  | (.4 | ) |  | — |  |  | (1.9 | ) |  | — |  |  | (.5 | )
Non-vested at September 30, |  | 930,000 |  |  | $ | 10.4 |  |  | 630,000 |  |  | $ | 8.1 |  |  | 930,000 |  |  | $ | 10.4 |  |  | 630,000 |  |  | $ | 8.1 |
Summary of OneBeacon option activity | The following table summarizes option activity for the three and nine months ended September 30, 2012 and 2011:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2012 | 2011 | 2012 | 2011
Millions, except share amounts |  | Target Options Outstanding |  | Target Options Outstanding |  | Target Options Outstanding |  | Target Options Outstanding
Beginning of period |  | — |  |  | 750,130 |  |  | 740,870 |  |  | 768,652 |
New awards |  | — |  |  | — |  |  | — |  |  | — |
Forfeitures and cancellations |  | — |  |  | (9,260 | ) |  | — |  |  | (27,782 | )
Vested and expired |  | — |  |  | — |  |  | (740,870 | ) |  | — |
Exercised |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | — |  |  | — |  |  | — |
Ending September 30, |  | — |  |  | 740,870 |  |  | — |  |  | 740,870 |

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