Segment Information

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Segment Informartion

Segment Information

White Mountains has determined that its reportable segments are OneBeacon, Sirius Group, HG Global/BAM and Other Operations.

White Mountains has made its segment determination based on consideration of the following criteria: (i) the nature of the business activities of each of the Company’s subsidiaries and affiliates; (ii) the manner in which the Company’s subsidiaries and affiliates are organized; (iii) the existence of primary managers responsible for specific subsidiaries and affiliates; and (iv) the organization of information provided to the chief operating decision makers and the Board of Directors.

Significant intercompany transactions among White Mountains’s segments have been eliminated herein. Financial information for White Mountains’s segments follows:

							HG Global/BAM
Millions	OneBeacon			Sirius Group			HG			BAM			Other Operations			Total
Three Months Ended September 30, 2014
Earned insurance and reinsurance premiums	$	305.4		$	231.4		$	.4		$	.1		$	1.3		$	538.6
Net investment income	10.4			9.8			.4			1.4			2.7			24.7
Net investment income (loss) - surplus note    interest	—			—			3.9			(3.9		)	—			—
Net realized and unrealized investment (losses) gains	(16.0		)	49.1			(.5		)	(1.4		)	(10.4		)	20.8
Other revenue	1.3			(22.8		)	—			.2			26.6			5.3
Total revenues	301.1			267.5			4.2			(3.6		)	20.2			589.4
Losses and LAE	185.2			103.6			—			—			.3			289.1
Insurance and reinsurance acquisition expenses	54.6			50.1			—			.5			.1			105.3
Other underwriting expenses	51.2			29.7			—			.1			—			81.0
General and administrative expenses	2.4			6.3			.4			8.9			51.3			69.3
Interest expense	3.2			6.6			—			—			.5			10.3
Total expenses	296.6			196.3			.4			9.5			52.2			555.0
Pre-tax income (loss)	$	4.5		$	71.2		$	3.8		$	(13.1	)	$	(32.0	)	$	34.4

						HG Global/BAM
Millions	OneBeacon		Sirius Group			HG		BAM			Other Operations			Total
Nine Months Ended September 30, 2014
Earned insurance and reinsurance premiums	$	872.8	$	656.5		$	.9	$	.3		$	5.1		$	1,535.6
Net investment income	32.1		30.3			1.0		4.2			10.5			78.1
Net investment income (loss) - surplus note    interest	—		—			11.8		(11.8		)	—			—
Net realized and unrealized investment gains	24.8		135.6			1.1		5.4			31.6			198.5
Other revenue	3.3		(47.3		)	—		.5			51.8			8.3
Total revenues	933.0		775.1			14.8		(1.4		)	99.0			1,820.5
Losses and LAE	520.7		273.8			—		—			6.6			801.1
Insurance and reinsurance acquisition expenses	150.9		146.3			.2		1.4			.5			299.3
Other underwriting expenses	152.3		91.7			—		.3			—			244.3
General and administrative expenses	9.3		21.6			1.2		26.6			131.2			189.9
Interest expense	9.7		19.8			—		—			.9			30.4
Total expenses	842.9		553.2			1.4		28.3			139.2			1,565.0
Pre-tax income (loss)	$	90.1	$	221.9		$	13.4	$	(29.7	)	$	(40.2	)	$	255.5

						HG Global/BAM
Millions	OneBeacon		Sirius Group			HG		BAM			Other Operations			Total
Three Months Ended September 30, 2013
Earned insurance and reinsurance premiums	$	278.9	$	221.4		$	.1	$	—		$	—		$	500.4
Net investment income	10.1		13.5			.2		1.1			2.4			27.3
Net investment income (loss) - surplus note    interest	—		—			10.1		(10.1		)	—			—
Net realized and unrealized investment    gains (losses)	17.0		(24.7		)	.5		2.4			33.0			28.2
Other revenue	5.5		16.8			—		.2			(4.3		)	18.2
Total revenues	311.5		227.0			10.9		(6.4		)	31.1			574.1
Losses and LAE	167.8		110.5			—		—			—			278.3
Insurance and reinsurance acquisition expenses	53.6		52.5			.1		.5			—			106.7
Other underwriting expenses	46.8		33.5			—		.1			—			80.4
General and administrative expenses	4.1		7.5			.3		8.1			21.5			41.5
Interest expense	3.3		6.6			—		—			2.0			11.9
Total expenses	275.6		210.6			.4		8.7			23.5			518.8
Pre-tax income (loss)	$	35.9	$	16.4		$	10.5	$	(15.1	)	$	7.6		$	55.3

						HG Global/BAM
Millions	OneBeacon		Sirius Group			HG			BAM			Other Operations		Total
Nine Months Ended September 30, 2013
Earned insurance and reinsurance premiums	$	846.2	$	646.9		$	.2		$	—		$	—	$	1,493.3
Net investment income	30.9		38.0			.7			3.3			11.6		84.5
Net investment income (loss) - surplus note    interest	—		—			30.2			(30.2		)	—		—
Net realized and unrealized investment    gains (losses)	19.9		(4.9		)	(1.7		)	(8.1		)	60.9		66.1
Other revenue	30.1		11.3			—			.3			5.2		46.9
Total revenues	927.1		691.3			29.4			(34.7		)	77.7		1,690.8
Losses and LAE	473.7		323.5			—			—			—		797.2
Insurance and reinsurance acquisition expenses	160.9		119.0			.1			1.0			—		281.0
Other underwriting expenses	150.7		93.0			—			.3			—		244.0
General and administrative expenses	11.0		23.0			1.1			24.2			66.2		125.5
Interest expense	9.8		19.7			—			—			2.9		32.4
Total expenses	806.1		578.2			1.2			25.5			69.1		1,480.1
Pre-tax income (loss)	$	121.0	$	113.1		$	28.2		$	(60.2	)	$	8.6	$	210.7