Segment Information (Tables)

9 Months Ended

Sep. 30, 2011

Segment Information

Financial information for White Mountains' segments

							Other
Millions	OneBeacon			Sirius Group			Operations			Total
Three months ended September 30, 2011
Earned insurance and reinsurance premiums	$	258.6		$	232.0		$	—		$	490.6
Net investment income	16.1			22.1			4.6			42.8
Net realized and unrealized investment gains (losses)	(47.4		)	64.7			(15.6		)	1.7
Other revenue	.1			(28.1		)	(5.8		)	(33.8		)
Total revenues	227.4			290.7			(16.8		)	501.3
Losses and loss adjustment expenses	146.6			130.5			—			277.1
Insurance and reinsurance acquisition expenses	58.6			48.4			—			107.0
Other underwriting expenses	38.7			28.3			—			67.0
General and administrative expenses	2.5			7.4			26.3			36.2
Interest expense on debt	4.1			6.5			2.2			12.8
Total expenses	250.5			221.1			28.5			500.1
Pre-tax income (loss)	$	(23.1	)	$	69.6		$	(45.3	)	$	1.2

						Other
Millions	OneBeacon		Sirius Group			Operations			Total
Three months ended September 30, 2010
Earned insurance and reinsurance premiums	$	293.6	$	204.5		$	—		$	498.1
Net investment income	21.6		23.0			4.3			48.9
Net realized and unrealized investment gains (losses)	51.6		(51.8		)	11.8			11.6
Other revenue	12.7		43.3			(63.6		)	(7.6		)
Total revenues	379.5		219.0			(47.5		)	551.0
Losses and loss adjustment expenses	155.2		98.2			—			253.4
Insurance and reinsurance acquisition expenses	64.3		37.8			—			102.1
Other underwriting expenses	50.5		24.5			—			75.0
General and administrative expenses	2.1		4.8			25.2			32.1
Interest expense on debt	6.4		6.7			.1			13.2
Total expenses	278.5		172.0			25.3			475.8
Pre-tax income (loss)	$	101.0	$	47.0		$	(72.8	)	$	75.2

							Other
Millions	OneBeacon			Sirius Group			Operations			Total
Nine months ended September 30, 2011
Earned insurance and reinsurance premiums	$	751.2		$	685.5		$	—		$	1,436.7
Net investment income	55.8			68.3			14.0			138.1
Net realized and unrealized investment gains (losses)	(13.3		)	102.6			(11.0		)	78.3
Other revenue	(10.6		)	(55.7		)	(2.3		)	(68.6		)
Total revenues	783.1			800.7			.7			1,584.5
Losses and loss adjustment expenses	414.9			499.1			—			914.0
Insurance and reinsurance acquisition expenses	161.1			135.1			—			296.2
Other underwriting expenses	132.1			79.4			—			211.5
General and administrative expenses	7.4			23.3			89.7			120.4
Interest expense on debt	16.4			19.6			2.8			38.8
Total expenses	731.9			756.5			92.5			1,580.9
Pre-tax income (loss)	$	51.2		$	44.2		$	(91.8	)	$	3.6

					Other
Millions	OneBeacon		Sirius Group		Operations			Total
Nine months ended September 30, 2010
Earned insurance and reinsurance premiums	$	1,134.7	$	638.2	$	—		$	1,772.9
Net investment income	74.9		71.3		11.2			157.4
Net realized and unrealized investment gains (losses)	79.6		13.7		11.4			104.7
Other revenue	1.9		36.4		(59.4		)	(21.1		)
Total revenues	1,291.1		759.6		(36.8		)	2,013.9
Losses and loss adjustment expenses	719.3		456.6		—			1,175.9
Insurance and reinsurance acquisition expenses	248.3		122.6		—			370.9
Other underwriting expenses	176.6		69.3		—			245.9
General and administrative expenses	9.4		23.2		86.9			119.5
Interest expense on debt	23.4		20.1		.7			44.2
Total expenses	1,177.0		691.8		87.6			1,956.4
Pre-tax income (loss)	$	114.1	$	67.8	$	(124.4	)	$	57.5