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Employee Share-Based Incentive Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
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, 2015 and 2014 for performance shares granted under the WTM Incentive Plan:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
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 |  | 109,129 |  |  | $ | 28.8 |  |  | 116,259 |  |  | $ | 46.3 |  |  | 113,198 |  |  | $ | 44.4 |  |  | 108,605 |  |  | $ | 54.9 |
Shares paid or expired(1) |  | (8,958 | ) |  | (5.5 | ) |  | — |  |  | — |  |  | (42,958 | ) |  | (30.7 | ) |  | (33,730 | ) |  | (24.1 | )
New grants |  | — |  |  | — |  |  | — |  |  | — |  |  | 29,828 |  |  | — |  |  | 41,580 |  |  | — |
Assumed forfeitures and cancellations(2) |  | (3,960 | ) |  | (.8 | ) |  | — |  |  | (.2 | ) |  | (3,857 | ) |  | (.3 | ) |  | (196 | ) |  | — |
Expense recognized |  | — |  |  | 30.0 |  |  | — |  |  | 6.3 |  |  | — |  |  | 39.1 |  |  | — |  |  | 21.6 |
End of period(3) |  | 96,211 |  |  | $ | 52.5 |  |  | 116,259 |  |  | $ | 52.4 |  |  | 96,211 |  |  | $ | 52.5 |  |  | 116,259 |  |  | $ | 52.4 |
(1) WTM performance share payments in 2015 for the 2012-2014 performance cycle ranged from 91% to 145.5% of target. WTM performance share payments in 2014 for the 2011-2013 performance cycle ranged from 88% to 131.5% of target. (2) Amounts include changes in assumed forfeitures, as required under GAAP. (3) Outstanding performance share awards as of September 30, 2015 and 2014 exclude 7,997 and 11,278 performance share awards, net of assumed forfeitures, granted to employees of Sirius Group, which is accounted for as discontinued operations.
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, 2015 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2015 – 2017 |  | 29,828 |  |  | $ | 6.3 |
2014 – 2016 |  | 32,557 |  |  | 12.3 |
2013 – 2015 |  | 36,293 |  |  | 35.4 |
Sub-total |  | 98,678 |  |  | 54.0 |
Assumed forfeitures |  | (2,467 | ) |  | (1.5 | )
Total at September 30, 2015 |  | 96,211 |  |  | $ | 52.5 |
Summary of restricted share activity | The following table summarizes the unrecognized compensation cost associated with the outstanding restricted share awards for the three and nine months ended September 30, 2015 and 2014:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
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 |  | 68,303 |  |  | $ | 21.9 |  |  | 79,011 |  |  | $ | 20.5 |  |  | 80,050 |  |  | $ | 13.7 |  |  | 90,341 |  |  | $ | 16.4 |
Issued |  | — |  |  | — |  |  | — |  |  | — |  |  | 22,078 |  |  | 14.7 |  |  | 20,400 |  |  | 11.8 |
Vested |  | (1,200 | ) |  | — |  |  | — |  |  | — |  |  | (35,025 | ) |  | — |  |  | (31,730 | ) |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (3.5 | ) |  | — |  |  | (3.2 | ) |  | — |  |  | (10.0 | ) |  | — |  |  | (10.9 | )
End of period (1) |  | 67,103 |  |  | $ | 18.4 |  |  | 79,011 |  |  | $ | 17.3 |  |  | 67,103 |  |  | $ | 18.4 |  |  | 79,011 |  |  | $ | 17.3 |
(1) Outstanding restricted share awards as of September 30, 2015 and 2014 exclude 3,571 and 2,314 restricted shares issued to employees of Sirius Group, which is accounted for as discontinued operations.
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, 2015 and 2014 for OneBeacon performance shares granted under the OneBeacon Incentive Plan:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
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 |  | 462,147 |  |  | $ | 2.4 |  |  | 512,938 |  |  | $ | 4.4 |  |  | 517,470 |  |  | $ | 3.4 |  |  | 493,421 |  |  | $ | 4.0 |
Shares paid or expired(1) |  | — |  |  | — |  |  | — |  |  | — |  |  | (181,290 | ) |  | (1.5 | ) |  | (142,138 | ) |  | (1.0 | )
New grants |  | — |  |  | — |  |  | — |  |  | — |  |  | 154,887 |  |  | — |  |  | 165,800 |  |  | — |
Assumed forfeitures and cancellations(2) |  | — |  |  | — |  |  | — |  |  | — |  |  | (28,920 | ) |  | — |  |  | (4,145 | ) |  | — |
Expense recognized |  | — |  |  | (.3 | ) |  | — |  |  | 1.1 |  |  | — |  |  | .2 |  |  | — |  |  | 2.5 |
End of period |  | 462,147 |  |  | $ | 2.1 |  |  | 512,938 |  |  | $ | 5.5 |  |  | 462,147 |  |  | $ | 2.1 |  |  | 512,938 |  |  | $ | 5.5 |
(1) OneBeacon performance share payments in 2015 for the 2012-2014 performance cycle were at 45.7% of target. OneBeacon performance share payments in 2014 for the 2011-2013 performance cycle were at 37.1% of target. (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 September 30, 2015 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2015 – 2017 |  | 154,887 |  |  | $ | .5 |
2014 – 2016 |  | 151,810 |  |  | .3 |
2013 – 2015 |  | 167,300 |  |  | 1.3 |
Sub-total |  | 473,997 |  |  | 2.1 |
Assumed forfeitures |  | (11,850 | ) |  | — |
Total at September 30, 2015 |  | 462,147 |  |  | $ | 2.1 |
Summary of OneBeacon restricted shares activity | The following table summarizes the unrecognized compensation cost associated with the outstanding OneBeacon restricted stock awards for the three and nine months ended September 30, 2015 and 2014:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
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 |  | 390,950 |  |  | $ | 3.5 |  |  | 612,500 |  |  | $ | 4.9 |  |  | 612,500 |  |  | $ | 3.5 |  |  | 915,000 |  |  | $ | 6.5 |
Issued |  | — |  |  | — |  |  | — |  |  | — |  |  | 75,950 |  |  | 1.1 |  |  | — |  |  | — |
Vested |  | — |  |  | — |  |  | — |  |  | — |  |  | (296,000 | ) |  | — |  |  | (300,000 | ) |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,500 | ) |  | — |  |  | (2,500 | ) |  | — |
Expense recognized |  | — |  |  | (.5 | ) |  | — |  |  | (.7 | ) |  | — |  |  | (1.6 | ) |  | — |  |  | (2.3 | )
End of period |  | 390,950 |  |  | $ | 3.0 |  |  | 612,500 |  |  | $ | 4.2 |  |  | 390,950 |  |  | $ | 3.0 |  |  | 612,500 |  |  | $ | 4.2 |

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