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Employee Share-Based Incentive Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2016
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, 2016 and 2015 for performance shares granted under the WTM Incentive Plan:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
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 | 73,297 |  |  | $ | 32.5 |  |  | 106,572 |  |  | $ | 28.8 |  |  | 93,654 |  |  | $ | 57.7 |  |  | 111,257 |  |  | $ | 44.4 |
Shares paid or expired(1) |  |  |  |  | (8,958 | ) |  | (5.5 | ) |  | (36,294 | ) |  | (41.0 | ) |  | (42,959 | ) |  | (30.4 | )
New grants(2) | 6,400 |  |  | — |  |  |  |  | — |  |  | 22,615 |  |  | — |  |  | 29,195 |  |  | — |
Forfeitures and cancellations(3) | (160 | ) |  | (.1 | ) |  | (3,960 | ) |  | (.8 | ) |  | (438 | ) |  | .2 |  |  | (3,839 | ) |  | (.3 | )
Expense recognized | — |  |  | 5.0 |  |  | — |  |  | 30.0 |  |  | — |  |  | 20.5 |  |  | — |  |  | 38.8 |
End of period(4) | 79,537 |  |  | $ | 37.4 |  |  | 93,654 |  |  | $ | 52.5 |  |  | 79,537 |  |  | $ | 37.4 |  |  | 93,654 |  |  | $ | 52.5 |
(1) WTM performance share payments in 2016 for the 2013-2015 performance cycle, which were paid in April 2016, ranged from 140% to 142% of target. WTM performance share payments in 2015 for the 2012-2014 performance cycle ranged from 88% to 131.5% of target. (2) In the third quarter of 2016 White Mountains granted 3,000 WTM performance shares for the 2015-2017 performance cycle and 3,400 WTM performance shares for the 2016-2018 performance cycle. (3) Amounts include changes in assumed forfeitures, as required under GAAP. (4) Outstanding performance share awards as of September 30, 2016 and 2015 both exclude 7,315 and 10,825 performance share awards granted to employees of Sirius Group.
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, 2016 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2016 – 2018 |  | 19,615 |  |  | $ | 3.4 |
2015 – 2017 |  | 31,795 |  |  | 15.1 |
2014 – 2016 |  | 30,167 |  |  | 19.9 |
Sub-total |  | 81,577 |  |  | 38.4 |
Assumed forfeitures |  | (2,040 | ) |  | (1.0 | )
Total at September 30, 2016 |  | 79,537 |  |  | $ | 37.4 |
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, 2016 and 2015:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
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 |  | 66,470 |  |  | $ | 24.2 |  |  | 71,875 |  |  | $ | 23.2 |  |  | 70,675 |  |  | $ | 15.7 |  |  | 83,314 |  |  | $ | 14.3 |
Issued |  | 4,150 |  |  | 3.4 |  |  |  |  |  |  |  |  | 25,365 |  |  | 19.7 |  |  | 23,640 |  |  | 15.7 |
Vested |  | — |  |  | — |  |  | (1,200 | ) |  | — |  |  | (24,620 | ) |  | — |  |  | (36,279 | ) |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |  |  | (800 | ) |  | .2 |  |  | — |  |  | — |
Expense recognized (1) |  | — |  |  | (3.8 | ) |  | — |  |  | (3.7 | ) |  | — |  |  | (11.8 | ) |  | — |  |  | (10.5 | )
End of period (2) |  | 70,620 |  |  | $ | 23.8 |  |  | 70,675 |  |  | $ | 19.5 |  |  | 70,620 |  |  | $ | 23.8 |  |  | 70,675 |  |  | $ | 19.5 |
(1) In connection with the sale of Sirius Group in the second quarter of 2016, White Mountains recognized $1.4 from accelerating the amortization of the issue date fair value for shares issued to Sirius Group employees, who no longer have a service obligation to the Company. (2) Restricted share awards outstanding as of September 30, 2016 and 2015 include 2,512 and 3,572 restricted shares issued to employees of Sirius Group, which was 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, 2016 and 2015 for OneBeacon performance shares granted under the OneBeacon Incentive Plan:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
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 |  | 441,206 |  |  | $ | 1.0 |  |  | 462,147 |  |  | $ | 2.4 |  |  | 449,435 |  |  | $ | 1.4 |  |  | 517,470 |  |  | $ | 3.4 |
Shares paid or expired(1) |  | — |  |  | — |  |  | — |  |  | — |  |  | (167,300 | ) |  | (.7 | ) |  | (181,290 | ) |  | (1.5 | )
New grants |  | — |  |  | — |  |  | — |  |  | — |  |  | 163,150 |  |  | — |  |  | 154,887 |  |  | — |
Assumed forfeitures and cancellations(2) |  | — |  |  | — |  |  | — |  |  | — |  |  | (4,079 | ) |  | — |  |  | (28,920 | ) |  | — |
Expense recognized |  | — |  |  | .3 |  |  | — |  |  | (.3 | ) |  | — |  |  | .6 |  |  | — |  |  | .2 |
End of period |  | 441,206 |  |  | $ | 1.3 |  |  | 462,147 |  |  | $ | 2.1 |  |  | 441,206 |  |  | $ | 1.3 |  |  | 462,147 |  |  | $ | 2.1 |
(1) OneBeacon performance share payments in 2016 for the 2013-2015 performance cycle were at 24.3% of target. OneBeacon performance share payments in 2015 for the 2012-2014 performance cycle were at 45.7% 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, 2016 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2016 – 2018 |  | 163,150 |  |  | $ | .6 |
2015 – 2017 |  | 146,659 |  |  | .7 |
2014 – 2016 |  | 142,710 |  |  | — |
Sub-total |  | 452,519 |  |  | 1.3 |
Assumed forfeitures |  | (11,313 | ) |  | — |
Total at September 30, 2016 |  | 441,206 |  |  | $ | 1.3 |
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, 2016 and 2015:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
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 |  | 395,872 |  |  | $ | 3.5 |  |  | 390,950 |  |  | $ | 3.5 |  |  | 382,722 |  |  | $ | 2.5 |  |  | 612,500 |  |  | $ | 3.5 |
Issued |  | — |  |  | — |  |  | — |  |  | — |  |  | 170,650 |  |  | 2.3 |  |  | 75,950 |  |  | 1.1 |
Vested |  | — |  |  | — |  |  | — |  |  | — |  |  | (157,500 | ) |  | — |  |  | (296,000 | ) |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,500 | ) |  | — |
Expense recognized |  | — |  |  | (.7 | ) |  | — |  |  | (.5 | ) |  | — |  |  | (2.0 | ) |  | — |  |  | (1.6 | )
End of period |  | 395,872 |  |  | $ | 2.8 |  |  | 390,950 |  |  | $ | 3.0 |  |  | 395,872 |  |  | $ | 2.8 |  |  | 390,950 |  |  | $ | 3.0 |

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