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Employee Share-Based Incentive Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2014
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, 2014 and 2013 for performance shares granted under the WTM Incentive Plan:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
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 |  | 127,537 |  |  | $ | 50.5 |  |  | 118,976 |  |  | $ | 34.9 |  |  | 119,220 |  |  | $ | 60.2 |  |  | 119,357 |  |  | $ | 29.4 |
Shares paid or expired(1) |  | — |  |  | — |  |  | — |  |  | — |  |  | (37,130 | ) |  | (26.7 | ) |  | (47,310 | ) |  | (11.0 | )
New grants |  | — |  |  | — |  |  | 250 |  |  | — |  |  | 45,660 |  |  | — |  |  | 47,170 |  |  | — |
Assumed forfeitures and cancellations(2) |  | — |  |  | (.2 | ) |  | (6 | ) |  | (.2 | ) |  | (213 | ) |  | — |  |  | 3 |  |  | (.2 | )
Expense recognized |  | — |  |  | 6.8 |  |  | — |  |  | 7.1 |  |  | — |  |  | 23.6 |  |  | — |  |  | 23.6 |
Ending of period |  | 127,537 |  |  | $ | 57.1 |  |  | 119,220 |  |  | $ | 41.8 |  |  | 127,537 |  |  | $ | 57.1 |  |  | 119,220 |  |  | $ | 41.8 |
(1) WTM performance share payments in 2014 for the 2011-2013 performance cycle ranged from 88% to 131.5% of target. WTM performance share payments in 2013 for the 2010-2012 performance cycle ranged from 33% to 98% 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 September 30, 2014 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2014 – 2016 |  | 45,660 |  |  | $ | 7.2 |
2013 – 2015 |  | 47,170 |  |  | 21.6 |
2012 – 2014 |  | 37,977 |  |  | 29.8 |
Sub-total |  | 130,807 |  |  | 58.6 |
Assumed forfeitures |  | (3,270 | ) |  | (1.5 | )
Total at September 30, 2014 |  | 127,537 |  |  | $ | 57.1 |
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, 2014 and 2013:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
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 |  | 81,325 |  |  | $ | 20.9 |  |  | 95,380 |  |  | $ | 24.5 |  |  | 94,130 |  |  | $ | 17.0 |  |  | 69,910 |  |  | $ | 16.8 |
Issued |  | — |  |  | — |  |  | 250 |  |  | .1 |  |  | 20,400 |  |  | 11.8 |  |  | 25,720 |  |  | 14.4 |
Vested |  | — |  |  | — |  |  | — |  |  | — |  |  | (33,205 | ) |  | — |  |  | — |  |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (3.3 | ) |  | — |  |  | (3.8 | ) |  | — |  |  | (11.2 | ) |  | — |  |  | (10.4 | )
Non-vested at September 30, |  | 81,325 |  |  | $ | 17.6 |  |  | 95,630 |  |  | $ | 20.8 |  |  | 81,325 |  |  | $ | 17.6 |  |  | 95,630 |  |  | $ | 20.8 |
Summary of performance share activity for OneBeacon performance shares granted under OneBeacon Incentive Plan | The following table summarizes performance share activity for the three and nine months ended September 30, 2014 and 2013 for OneBeacon performance shares granted under the OneBeacon Incentive Plan:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
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 |  | 512,938 |  |  | $ | 4.4 |  |  | 489,867 |  |  | $ | 2.4 |  |  | 493,421 |  |  | $ | 4.0 |  |  | 563,190 |  |  | $ | 1.2 |
Shares paid or expired(1) |  | — |  |  | — |  |  | — |  |  | — |  |  | (142,138 | ) |  | (1.0 | ) |  | (238,658 | ) |  | — |
New grants |  | — |  |  | — |  |  | — |  |  | — |  |  | 165,800 |  |  | — |  |  | 179,000 |  |  | — |
Assumed forfeitures and cancellations(2) |  | — |  |  | — |  |  | — |  |  | — |  |  | (4,145 | ) |  | — |  |  | (13,665 | ) |  | (.1 | )
Expense recognized |  | — |  |  | 1.1 |  |  | — |  |  | .1 |  |  | — |  |  | 2.5 |  |  | — |  |  | 1.4 |
Ending of period |  | 512,938 |  |  | $ | 5.5 |  |  | 489,867 |  |  | $ | 2.5 |  |  | 512,938 |  |  | $ | 5.5 |  |  | 489,867 |  |  | $ | 2.5 |
(1) OneBeacon performance share payments in 2014 for the 2011-2013 performance cycle were at 37.1% of target. No payments were made in 2013 for the 2010-2012 OneBeacon performance cycle as the performance factor was zero. (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, 2014 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2014 – 2016 |  | 165,800 |  |  | $ | .6 |
2013 – 2015 |  | 179,000 |  |  | 2.2 |
2012 – 2014 |  | 181,290 |  |  | 2.8 |
Sub-total |  | 526,090 |  |  | 5.6 |
Assumed forfeitures |  | (13,152 | ) |  | (.1 | )
Total at September 30, 2014 |  | 512,938 |  |  | $ | 5.5 |
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, 2014 and 2013:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
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 |  | 612,500 |  |  | $ | 4.9 |  |  | 918,000 |  |  | $ | 8.0 |  |  | 915,000 |  |  | $ | 6.5 |  |  | 927,000 |  |  | $ | 9.6 |
Issued |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Vested |  | — |  |  | — |  |  | — |  |  | — |  |  | (300,000 | ) |  | — |  |  | (9,000 | ) |  | — |
Forfeited |  | — |  |  | — |  |  | (3,000 | ) |  | — |  |  | (2,500 | ) |  | — |  |  | (3,000 | ) |  | — |
Expense recognized |  | — |  |  | (.7 | ) |  | — |  |  | (.7 | ) |  | — |  |  | (2.3 | ) |  | — |  |  | (2.3 | )
Non-vested at September 30, |  | 612,500 |  |  | $ | 4.2 |  |  | 915,000 |  |  | $ | 7.3 |  |  | 612,500 |  |  | $ | 4.2 |  |  | 915,000 |  |  | $ | 7.3 |

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