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Employee Share-Based Incentive Compensation Plans | 3 Months Ended
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Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Employee Share-Based Incentive Compensation Plans | Employee Share-Based Incentive Compensation Plans White Mountains’ Long-Term Incentive Plan (the “WTM Incentive Plan”) provides for grants of various types of share-based and non share-based incentive awards to key employees and service providers of the Company and certain of its subsidiaries. White Mountains’ share-based compensation incentive awards consist of performance shares, restricted shares and stock options. Share-Based Compensation Based on White Mountains Common Shares WTM Performance Shares Performance shares are conditional grants of a specified maximum number of common shares or an equivalent amount of cash. Performance share awards vest, subject to the attainment of performance goals, at the end of a three-year period and are valued based on the market value of common shares at the time awards are paid. The following table summarizes performance share activity for the three months ended March 31, 2013 and 2012 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 March 31,
|  | 2013 |  | 2012
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 119,357 |  |  | $ | 29.4 |  |  | 150,064 |  |  | $ | 66.1 |
Shares paid (1) |  | (47,310 | ) |  | (11.0 | ) |  | (68,357 | ) |  | (48.4 | )
New grants |  | 46,920 |  |  | — |  |  | 35,932 |  |  | — |
Assumed forfeitures and cancellations (2) |  | 9 |  |  | .1 |  |  | 811 |  |  | 1.0 |
Expense recognized |  | — |  |  | 10.1 |  |  | — |  |  | 8.7 |
Ending March 31, |  | 118,976 |  |  | $ | 28.6 |  |  | 118,450 |  |  | $ | 27.4 |
(1) WTM performance share payments in 2013 for the 2010-2012 performance cycle ranged from 33% to 98% of target. WTM performance share payments in 2012 for the 2009-2011 performance cycle ranged from 147% to 155% of target. (2) Amounts include changes in assumed forfeitures, as required under GAAP. For the 2009-2011 performance cycle, the Company issued common shares for 9,577 performance shares earned and all other performance shares earned were settled in cash. For the 2010-2012 performance cycle, the Company settled all performance shares earned in cash. If the outstanding WTM performance shares had vested on March 31, 2013, the total additional compensation cost to be recognized would have been $44.4 million, based on accrual factors at March 31, 2013 (common share price and payout assumptions). Performance Shares granted 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, 2013 for each performance cycle:
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2013 – 2015 |  | 46,920 |  |  | $ | 2.2 |
2012 – 2014 |  | 37,977 |  |  | 11.4 |
2011 – 2013 |  | 37,130 |  |  | 15.8 |
Sub-total |  | 122,027 |  |  | 29.4 |
Assumed forfeitures |  | (3,051 | ) |  | (.8 | )
Total at March 31, 2013 |  | 118,976 |  |  | $ | 28.6 |
Restricted Shares The following outlines the unrecognized compensation cost associated with the outstanding restricted share awards for the three months ended March 31, 2013 and 2012:
|  | Three Months Ended March 31,
|  | 2013 |  | 2012
Millions, except share amounts |  | Restricted Shares |  | Unamortized Issue Date Fair Value |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  | 69,910 |  |  | $ | 16.8 |  |  | 72,000 |  |  | $ | 13.3 |
Issued |  | 25,470 |  |  | 14.3 |  |  | 28,460 |  |  | 13.7 |
Vested |  | — |  |  | — |  |  | (7,000 | ) |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (2.9 | ) |  | — |  |  | (2.5 | )
Non-vested at March 31, |  | 95,380 |  |  | $ | 28.2 |  |  | 93,460 |  |  | $ | 24.5 |
During the first quarter of 2013, White Mountains issued 25,470 restricted shares that vest on January 1, 2016. During the first quarter of 2012, White Mountains issued 25,460 restricted shares that vest on January 1, 2015 and 3,000 restricted shares that vest in two equal annual installments beginning in February 2014. The unrecognized compensation cost at March 31, 2013 is expected to be recognized ratably over the remaining vesting periods. Share-Based Compensation Based on OneBeacon Ltd. Common Shares The OneBeacon Long-Term Incentive Plan (the “OneBeacon Incentive Plan”) provides for grants of various types of share-based and non share-based incentive awards to key employees of OneBeacon Ltd. and certain of its subsidiaries. OneBeacon’s share-based incentive awards include OneBeacon performance shares and restricted shares. OneBeacon Performance Shares OneBeacon performance shares are conditional grants of a specified maximum number of common shares or an equivalent amount of cash. OneBeacon performance share awards vest, subject to the attainment of performance goals, at the end of a three-year period and are valued based on the market value of OneBeacon Ltd. common shares at the time awards are paid. The following table summarizes performance share activity for the three months ended March 31, 2013 and 2012 for OneBeacon performance shares granted under the OneBeacon Incentive Plan:
|  | Three Months Ended March 31,
|  | 2013 |  | 2012
Millions, except share amounts |  | Target Performance Shares Outstanding |  | Accrued Expense |  | Target Performance Shares Outstanding |  | Accrued Expense
Beginning of period |  | 563,190 |  |  | $ | 1.2 |  |  | 642,667 |  |  | $ | 9.7 |
Shares paid or expired (1) |  | (238,658 | ) |  | — |  |  | (249,733 | ) |  | (7.5 | )
New awards |  | 179,000 |  |  | — |  |  | 181,290 |  |  | — |
Assumed forfeitures and cancellations (2) |  | (13,665 | ) |  | — |  |  | (4,479 | ) |  | — |
Expense recognized |  | — |  |  | .4 |  |  | — |  |  | 1.0 |
Ending March 31, |  | 489,867 |  |  | $ | 1.6 |  |  | 569,745 |  |  | $ | 3.2 |
(1) There were no payments made in 2013 for the 2010-2012 performance cycle; those performance shares did not meet the threshold performance goals and expired. OneBeacon performance share payments in 2012 for the 2009-2011 performance cycle were at 138.6% of target. Amounts include deposits into OneBeacon’s deferred compensation plan. (2) Amounts include changes in assumed forfeitures, as required under GAAP. If the outstanding OneBeacon performance shares had been vested on March 31, 2013, the total additional compensation cost to be recognized would have been $1.4 million, based on accrual factors at March 31, 2013 (common share price and payout assumptions). The following table summarizes OneBeacon performance shares outstanding awarded under the OneBeacon Incentive Plan at March 31, 2013 for each performance cycle:
Millions, except share amounts |  | Target OneBeacon Performance Shares Outstanding |  | Accrued Expense
Performance cycle: |  |  |  |  |  |
2013 – 2015 |  | 179,000 |  |  | $ | .2 |
2012 – 2014 |  | 181,290 |  |  | 1.1 |
2011 – 2013 |  | 142,138 |  |  | .3 |
Sub-total |  | 502,428 |  |  | 1.6 |
Assumed forfeitures |  | (12,561 | ) |  | — |
Total at March 31, 2013 |  | 489,867 |  |  | $ | 1.6 |
OneBeacon Restricted Shares The following summarizes the unrecognized compensation cost associated with the outstanding OneBeacon restricted share awards for the three months ended March 31, 2013 and 2012:
|  | Three Months Ended March 31,
|  | 2013 |  | 2012
Millions, except share amounts |  | Restricted Shares |  | Unamortized Issue Date Fair Value |  | Restricted Shares |  | Unamortized Issue Date Fair Value
Non-vested, |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  | 927,000 |  |  | $ | 9.6 |  |  | 630,000 |  |  | $ | 7.7 |
Issued |  | — |  |  | — |  |  | 300,000 |  |  | 4.6 |
Vested |  | (9,000 | ) |  | — |  |  | — |  |  | — |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |
Expense recognized |  | — |  |  | (.8 | ) |  | — |  |  | (.4 | )
Non-vested at March 31, |  | 918,000 |  |  | $ | 8.8 |  |  | 930,000 |  |  | $ | 11.9 |
On March 1, 2012, OneBeacon issued 300,000 restricted shares that vest in two equal annual installments on February 28, 2014 and 2015. On May 25, 2011, OneBeacon issued 630,000 restricted shares to its CEO that vest in four equal annual installments beginning on February 22, 2014. Concurrently with the grant of the restricted shares, 35,000 OneBeacon performance shares issued to OneBeacon’s CEO for the 2011-2013 performance share cycle were forfeited and performance share awards to OneBeacon’s CEO for the subsequent five years have been or will also be reduced by 35,000 shares. The unrecognized compensation cost at March 31, 2013 is expected to be recognized ratably over the remaining vesting periods.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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