Retirement and Postretirement Plans (Tables)

12 Months Ended

Dec. 31, 2013

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 at December 31, 2013 and 2012:

	Pension Benefits December 31,
Millions	2013			2012
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	119.5		$	113.0
Service cost	.8			.7
Interest cost	4.2			4.7
Settlement gain	—			(.7		)
Special termination benefit cost	.3			.6
Assumption changes	(13.0		)	11.2
Actuarial gain	(.5		)	(.2		)
Benefits and expenses paid with plan assets	(6.2		)	(7.5		)
Benefits paid directly by OneBeacon	(2.2		)	(2.3		)
Projected benefit obligation at end of year	$	102.9		$	119.5
Change in plan assets:
Fair value of plan assets at beginning of year	$	124.7		$	120.8
Actual return on plan assets	24.3			11.4
Benefits and expenses paid	(6.2		)	(7.5		)
Fair value of plan assets at end of year	$	142.8		$	124.7
Funded status at end of year	$	39.9		$	5.2

Schedule of amounts recorded in financial statements

Amounts recognized in the financial statements as of December 31, 2013 and 2012 consist of:

	December 31,
Millions	2013			2012
Net assets of the Qualified Plan recorded in other assets	$	64.1		$	32.8
Net liabilities of the Non-qualified Plan recorded in other liabilities	(24.2		)	(27.6		)
Net amount accrued in the financial statements	$	39.9		$	5.2

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	2013		2012
Projected benefit obligation	$	24.2	$	27.6
Accumulated benefit obligation	$	24.2	$	27.6
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	2013		2012
Projected benefit obligation	$	78.7	$	91.9
Accumulated benefit obligation	$	78.7	$	91.9
Fair value of plan net assets(1)	$	142.8	$	124.7

⁽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, 2013 and 2012 were as follows:

	December 31,
Millions	2013			2012
Accumulated other comprehensive loss beginning balance	$	(21.2	)	$	(16.7	)
Increase (decrease) in accumulated other comprehensive income (loss):
Amortization of net actuarial losses recognized during the year	.9			.8
Net actuarial gains (losses) occurring during the year(1)	30.8			(5.9		)
Other adjustments	—			.6
Accumulated other comprehensive income (loss) ending balance	$	10.5		$	(21.2	)

⁽¹⁾  Net actuarial gains (losses) resulted from investment returns and demographic experience different than assumed, as well as changes in assumptions in estimating the projected benefit obligation in the years ended December 31, 2013 and 2012.

Schedule of components of net periodic benefit cost (income)

The components of net periodic benefit (income) cost for the years ended December 31, 2013, 2012 and 2011 were as follows:

	Year Ended December 31,
Millions	2013			2012			2011
Service cost	$	.8		$	.7		$	.8
Interest cost	4.2			4.7			5.2
Expected return on plan assets	(7.1		)	(6.9		)	(7.6		)
Amortization of unrecognized loss	.9			.8			.5
Net periodic pension income before settlements, curtailments and    special termination benefits	(1.2		)	(.7		)	(1.1		)
Settlement loss	—			.6			.5
Special termination benefits expense(1)	.3			.6			.8
Total net periodic benefit (income) cost	$	(.9	)	$	.5		$	.2

⁽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, 2013 and 2012 by asset category were as follows:

	December 31, 2013								December 31, 2012
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	$	—
Common equity securities	103.3		103.3		—		—		79.5		79.5		—		—
Convertible fixed maturity investments	29.9		—		29.9		—		34.5		—		34.5		—
Cash and short-term investments	8.9		8.8		.1		—		8.1		8.1		—		—
Total	$	142.1	$	112.1	$	30.0	$	—	$	124.0	$	87.6	$	36.4	$	—

There were no transfers between Levels 1, 2 or 3 during the years ended December 31, 2013 and 2012.

The Qualified Plan’s asset allocations at December 31, 2013 and 2012, by asset category were as follows:

	Plan Assets at December 31,
Asset Category	2013		2012
Fixed maturity investments	—	%	1.5	%
Common equity securities	72.7		64.2
Convertible fixed maturity investments	21.1		27.8
Cash and short-term investments	6.2		6.5
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
2014	$	5.1
2015	5.4
2016	5.6
2017	5.8
2018	6.1
2019-2023	33.9