XML 69 R49.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Retirement and Postretirement Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of changes in projected benefit obligations and fair value of plan assets and funded status of plan assets | The following tables set forth the obligations and funded status, assumptions, plan assets and cash flows associated with the Plans as of December 31, 2015 and 2014:
|  | Pension Benefits December 31,
Millions |  | 2015 |  | 2014
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 119.7 |  |  | $ | 102.9 |
Service cost |  | .9 |  |  | .6 |
Interest cost |  | 4.6 |  |  | 4.7 |
Settlement loss (1) |  | (1.8 | ) |  | — |
Special termination benefits expense |  | — |  |  | .3 |
Assumption changes |  | (3.5 | ) |  | 17.5 |
Actuarial loss |  | .9 |  |  | 1.1 |
Benefits and expenses paid with plan assets |  | (13.7 | ) |  | (5.2 | )
Benefits paid directly by OneBeacon |  | (2.2 | ) |  | (2.2 | )
Remeasurement due to plan termination (2) |  | 4.6 |  |  | — |
Projected benefit obligation at end of year |  | $ | 109.5 |  |  | $ | 119.7 |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 146.0 |  |  | $ | 142.8 |
Actual return on plan assets |  | 7.5 |  |  | 8.4 |
Benefits and expenses paid |  | (13.7 | ) |  | (5.2 | )
Fair value of plan assets at end of year |  | $ | 139.8 |  |  | $ | 146.0 |
Funded status at end of year |  | $ | 30.3 |  |  | $ | 26.3 |
(1) During the fourth quarter of 2015, OneBeacon triggered settlement accounting for the Qualified Plan as the total lump sum payments exceeded the service plus interest costs, resulting in a $1.8 adverse effect on accumulated other comprehensive income. (2) As noted in the paragraph preceding this table, the projected benefit obligation was valued on a plan termination basis as of December 31, 2015.
Schedule of amounts recorded in financial statements | Amounts recognized in the financial statements as of December 31, 2015 and 2014 consist of:
|  | December 31,
Millions |  | 2015 |  | 2014
Net assets of the Qualified Plan recorded in other assets |  | $ | 55.8 |  |  | $ | 53.4 |
Net liabilities of the Non-qualified Plan recorded in other liabilities |  | (25.5 | ) |  | (27.1 | )
Net amount accrued in the financial statements |  | $ | 30.3 |  |  | $ | 26.3 |
Information for the Non-qualified Plan, which has accumulated benefit obligations in excess of plan assets | Information for the Non-qualified Plan, which had accumulated benefit obligations in excess of plan assets, was as follows:
|  | December 31,
Millions |  | 2015 |  | 2014
Projected benefit obligation |  | $ | 25.5 |  |  | $ | 27.1 |
Accumulated benefit obligation |  | $ | 25.5 |  |  | $ | 27.1 |
Fair value of plan assets |  | $ | — |  |  | $ | — |
Information for the Qualified Plan, which had accumulated benefit obligations less than plan assets | Information for the Qualified Plan, which had accumulated benefit obligations less than plan assets, was as follows:
|  | December 31,
Millions |  | 2015 |  | 2014
Projected benefit obligation |  | $ | 84.0 |  | (1) | $ | 92.6 |
Accumulated benefit obligation |  | $ | 84.0 |  | (1) | $ | 92.6 |
Fair value of plan net assets |  | $ | 139.8 |  |  | $ | 146.0 |
(1) Measured on a plan termination basis
Schedule of amounts recognized in accumulated other comprehensive income (loss) on a pre-tax basis and before noncontrolling interest | The amounts recognized in accumulated other comprehensive income (loss) on a pre-tax basis and before non-controlling interest for the years ended December 31, 2015 and 2014 were as follows:
|  | December 31,
Millions |  | 2015 |  | 2014
Accumulated other comprehensive (loss) income beginning balance |  | $ | (8.0 | ) |  | $ | 10.5 |
Increase (decrease) in accumulated other comprehensive income (loss): |  |  |  |  |  |
Amortization of net actuarial gains recognized during the year |  | 1.3 |  |  | .3 |
Net actuarial losses occurring during the year (1) |  | (1.3 | ) |  | (18.8 | )
Accumulated other comprehensive loss ending balance |  | $ | (8.0 | ) |  | $ | (8.0 | )
(1) | Net actuarial gains (losses) resulted from investment returns and demographic experience different than assumed. The 2015 amount reflects the valuation of the Qualified Plan on a termination basis.
Schedule of components of net periodic benefit cost (income) | The components of net periodic benefit (income) cost for the years ended December 31, 2015, 2014 and 2013 were as follows:
|  | Year Ended December 31,
Millions |  | 2015 |  | 2014 |  | 2013
Service cost |  | $ | .9 |  |  | $ | .6 |  |  | $ | .8 |
Interest cost |  | 4.6 |  |  | 4.7 |  |  | 4.2 |
Expected return on plan assets |  | (8.7 | ) |  | (8.5 | ) |  | (7.1 | )
Amortization of unrecognized loss |  | 1.3 |  |  | .3 |  |  | .9 |
Net periodic pension income before settlements, curtailments and special termination benefits |  | (1.9 | ) |  | (2.9 | ) |  | (1.2 | )
Special termination benefits expense(1) |  | — |  |  | .3 |  |  | .3 |
Total net periodic benefit income |  | $ | (1.9 | ) |  | $ | (2.6 | ) |  | $ | (.9 | )
(1) | Special termination benefits represent additional payments made from the Qualified Plan to certain vested participants when their employment was terminated due to a reduction in force.
Schedule of fair value of the Plan assets and their related inputs | The fair value of the Qualified Plan’s assets and their related inputs as of December 31, 2015 and 2014 by asset category were as follows:
|  | December 31, 2015 |  | December 31, 2014
Millions |  | Fair Value |  | Level 1 Inputs |  | Level 2 Inputs |  | Level 3 Inputs |  | Fair Value |  | Level 1 Inputs |  | Level 2 Inputs |  | Level 3 Inputs
Fixed maturity investments |  | $ | 132.4 |  |  | $ | 132.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 24.2 |  |  | $ | — |  |  | $ | 24.2 |  |  | $ | — |
Common equity securities |  | — |  |  | — |  |  | — |  |  | — |  |  | 101.0 |  |  | 101.0 |  |  | — |  |  | — |
Convertible fixed maturity investments |  | — |  |  | — |  |  | — |  |  | — |  |  | 12.8 |  |  | — |  |  | 12.8 |  |  | — |
Cash and short-term investments |  | 7.0 |  |  | 7.0 |  |  | — |  |  | — |  |  | 5.2 |  |  | 4.8 |  |  | .4 |  |  | — |
Total |  | $ | 139.4 |  |  | $ | 139.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 143.2 |  |  | $ | 105.8 |  |  | $ | 37.4 |  |  | $ | — |
There were no transfers between Levels 1, 2 or 3 during the years ended December 31, 2015 and 2014. The Qualified Plan’s asset allocations as of December 31, 2015 and 2014, by asset category were as follows:
|  | Plan Assets at December 31,
Asset Category |  | 2015 |  | 2014
Fixed maturity investments |  | 95.0 | % |  | 16.9 | %
Common equity securities |  | — |  |  | 70.6 |
Convertible fixed maturity investments |  | — |  |  | 8.9 |
Cash and short-term investments |  | 5.0 |  |  | 3.6 |
Total |  | 100.0 | % |  | 100.0 | %
Schedule of expected future benefit payments | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid:
Millions |  | Expected Benefit Payments
2016 |  | $ | 86.8 |
2017 |  | 2.1 |
2018 |  | 2.1 |
2019 |  | 2.0 |
2020 |  | 2.0 |
2021-2025 |  | 8.9 |
(1) Primarily reflects the anticipated payout related to annuity purchases and lump sum payments resulting from the termination of the Qualified Plan

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
Name: | us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetFundedStatusTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation is less than the fair value of plan assets. + References No definition available. + Details
Name: | wtm_ScheduleOfAccumulatedBenefitObligationsLessThanFairValueOfPlanAssetsTableTextBlock
Namespace Prefix: | wtm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration