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Employee Share-Based Incentive Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2015 and 2014 for performance shares granted under the WTM Incentive Plan:
|  | Three Months Ended March 31,
|  | 2015 |  | 2014
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 123,549 |  |  | $ | 48.1 |  |  | 119,220 |  |  | $ | 60.2 |
Shares paid or expired(1) |  | (37,977 | ) |  | (27.3 | ) |  | (37,130 | ) |  | (26.7 | )
New grants |  | 30,640 |  |  | — |  |  | 45,660 |  |  | — |
Assumed forfeitures and cancellations(2) |  | 184 |  |  | .6 |  |  | (213 | ) |  | .4 |
Expense recognized |  | — |  |  | 6.2 |  |  | — |  |  | 8.4 |
Ending of period |  | 116,396 |  |  | $ | 27.6 |  |  | 127,537 |  |  | $ | 42.3 |
(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.
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, 2015 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2015 – 2017 |  | 30,640 |  |  | $ | 1.8 |
2014 – 2016 |  | 41,937 |  |  | 5.6 |
2013 – 2015 |  | 46,803 |  |  | 20.9 |
Sub-total |  | 119,380 |  |  | 28.3 |
Assumed forfeitures |  | (2,984 | ) |  | (.7 | )
Total at March 31, 2015 |  | 116,396 |  |  | $ | 27.6 |
Summary of restricted share activity | The following table summarizes the unrecognized compensation cost associated with the outstanding restricted share awards for the three months ended March 31, 2015 and 2014:
|  | Three Months Ended March 31,
|  | 2015 |  | 2014
Millions, except share amounts |  | Restricted Shares |  | Unamortized Issue Date Fair Value |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  | 83,314 |  |  | $ | 14.3 |  |  | 94,130 |  |  | $ | 17.0 |
Issued |  | 22,890 |  |  | 15.2 |  |  | 20,400 |  |  | 11.8 |
Vested |  | (35,079 | ) |  | — |  |  | (33,205 | ) |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (3.0 | ) |  | — |  |  | (4.0 | )
Non-vested at March 31, |  | 71,125 |  |  | $ | 26.5 |  |  | 81,325 |  |  | $ | 24.8 |
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, 2015 and 2014 for OneBeacon performance shares granted under the OneBeacon Incentive Plan:
|  | Three Months Ended March 31,
|  | 2015 |  | 2014
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 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 |  | — |  |  | .2 |  |  | — |  |  | .6 |
Ending of period |  | 462,147 |  |  | $ | 2.1 |  |  | 512,938 |  |  | $ | 3.6 |
(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 March 31, 2015 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2015 – 2017 |  | 154,887 |  |  | $ | .2 |
2014 – 2016 |  | 151,810 |  |  | .5 |
2013 – 2015 |  | 167,300 |  |  | 1.4 |
Sub-total |  | 473,997 |  |  | 2.1 |
Assumed forfeitures |  | (11,850 | ) |  | — |
Total at March 31, 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 months ended March 31, 2015 and 2014:
|  | Three Months Ended March 31,
|  | 2015 |  | 2014
Millions, except share amounts |  | Restricted Shares |  | Unamortized Issue Date Fair Value |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  | 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 |  | — |  |  | (.6 | ) |  | — |  |  | (.8 | )
Non-vested at March 31, |  | 390,950 |  |  | $ | 4.0 |  |  | 612,500 |  |  | $ | 5.7 |

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