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Retirement and Postretirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
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 various pension plans at December 31, 2012 and 2011:
|  | Pension Benefits
Millions |  | 2012 |  | 2011
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 113.0 |  |  | $ | 110.2 |
Service cost |  | .7 |  |  | .8 |
Interest cost |  | 4.7 |  |  | 5.2 |
Settlement gain |  | (.7 | ) |  | (.6 | )
Special termination benefit cost |  | .6 |  |  | .8 |
Assumption changes |  | 11.2 |  |  | 7.7 |
Actuarial (gain) loss |  | (.2 | ) |  | (.3 | )
Benefits and expenses paid with plan assets, net of participant contributions |  | (7.5 | ) |  | (8.4 | )
Benefits paid directly by OneBeacon |  | (2.3 | ) |  | (2.4 | )
Projected benefit obligation at end of year |  | $ | 119.5 |  |  | $ | 113.0 |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 120.8 |  |  | $ | 133.0 |
Actual return on plan assets |  | 11.4 |  |  | (3.8 | )
Benefits and expenses paid, net of participant contributions |  | (7.5 | ) |  | (8.4 | )
Fair value of plan assets at end of year |  | $ | 124.7 |  |  | $ | 120.8 |
Funded status at end of year |  | $ | 5.2 |  |  | $ | 7.8 |
Schedule of amounts recorded in financial statements | Amounts recognized in the financial statements as of December 31, 2012 and 2011 consist of:
|  | December 31,
Millions |  | 2012 |  | 2011
Net assets of the Qualified Plan recorded in other assets |  | $ | 32.8 |  |  | $ | 34.3 |
Net liabilities of the Non-qualified Plan recorded in other liabilities |  | (27.6 | ) |  | (26.5 | )
Net amount accrued in the financial statements |  | $ | 5.2 |  |  | $ | 7.8 |
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 |  | 2012 |  | 2011
Projected benefit obligation |  | $ | 27.6 |  |  | $ | 26.5 |
Accumulated benefit obligation |  | $ | 27.6 |  |  | $ | 26.5 |
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 |  | 2012 |  | 2011
Projected benefit obligation |  | $ | 91.9 |  |  | $ | 86.5 |
Accumulated benefit obligation |  | $ | 91.9 |  |  | $ | 86.5 |
Fair value of plan net assets (1) |  | $ | 124.7 |  |  | $ | 120.8 |
(1) | Includes receivables related to securities sold, interest and dividends as well as payables related to securities purchased.
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, 2012 and 2011 were as follows:
|  | December 31,
Millions |  | 2012 |  | 2011
Accumulated other comprehensive (loss) income beginning balance |  | $ | (16.7 | ) |  | $ | .5 |
Increase (decrease) in accumulated other comprehensive income (loss): |  |  |  |  |  |
Amortization of net actuarial losses recognized during the year |  | .8 |  |  | .5 |
Net actuarial losses occurring during the year (1) |  | (5.9 | ) |  | (18.2 | )
Other adjustments |  | .6 |  |  | .5 |
Accumulated other comprehensive loss ending balance |  | $ | (21.2 | ) |  | $ | (16.7 | )
(1) | Net actuarial losses resulted from a decrease in investment returns on plan assets in the year ended December 31, 2011 and changes in assumptions in estimating the projected benefit obligation in the years ended December 31, 2012 and 2011.
Schedule of components of net periodic benefit cost (income) | The components of net periodic benefit cost for the years ended December 31, 2012, 2011 and 2010 were as follows:
|  | Year Ended December 31,
Millions |  | 2012 |  | 2011 |  | 2010
Service cost |  | $ | .7 |  |  | $ | .8 |  |  | $ | .8 |
Interest cost |  | 4.7 |  |  | 5.2 |  |  | 6.0 |
Expected return on plan assets |  | (6.9 | ) |  | (7.6 | ) |  | (7.3 | )
Amortization of unrecognized loss |  | $ | .8 |  |  | $ | .5 |  |  | $ | .6 |
Net periodic pension (income) cost before settlements, curtailments and special termination benefits |  | $ | (.7 | ) |  | $ | (1.1 | ) |  | $ | .1 |
Settlement gain (loss) |  | .6 |  |  | .5 |  |  | (.1 | )
Special termination benefits expense (1) |  | .6 |  |  | .8 |  |  | 1.9 |
Total net periodic benefit cost |  | $ | .5 |  |  | $ | .2 |  |  | $ | 1.9 |
(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 at December 31, 2012 by asset category were as follows:
|  | December 31, 2012 |  | December 31, 2011
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 |  | $ | 1.9 |  |  | $ | — |  |  | $ | 1.9 |  |  | $ | — |  |  | $ | 2.4 |  |  | $ | — |  |  | $ | 2.4 |  |  | $ | — |
Common equity securities |  | 79.5 |  |  | 79.5 |  |  | — |  |  | — |  |  | 72.2 |  |  | 72.2 |  |  | — |  |  | — |
Convertible fixed maturities |  | 34.5 |  |  | — |  |  | 34.5 |  |  | — |  |  | 42.8 |  |  | — |  |  | 42.8 |  |  | — |
Cash and short-term investments |  | 8.1 |  |  | 8.1 |  |  | — |  |  | — |  |  | 3.1 |  |  | 3.1 |  |  | — |  |  | — |
Total |  | $ | 124.0 |  |  | $ | 87.6 |  |  | $ | 36.4 |  |  | $ | — |  |  | $ | 120.5 |  |  | $ | 75.3 |  |  | $ | 45.2 |  |  | $ | — |
There were no transfers between Levels 1, 2 or 3 during the years ended December 31, 2012 or 2011. The Qualified Plan’s asset allocations at December 31, 2012 and 2011, by asset category were as follows:
|  | Plan Assets at December 31,
Asset Category |  | 2012 |  | 2011
Fixed maturity investments |  | 1.5 | % |  | 2.0 | %
Common equity securities |  | 64.2 | % |  | 59.9 | %
Convertible fixed maturities |  | 27.8 | % |  | 35.5 | %
Cash and short-term investments |  | 6.5 | % |  | 2.6 | %
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
2013 |  | $ | 5.2 |
2014 |  | 5.5 |
2015 |  | 5.8 |
2016 |  | 6.0 |
2017 |  | 6.2 |
2018-2022 |  | 35.0 |

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- 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=21915506&loc=d3e2417-114920 + Details
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- 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=21915506&loc=d3e1928-114920 + Details
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- 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=21915506&loc=d3e1928-114920 + Details
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- 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=21915506&loc=d3e1928-114920 + Details
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