Segment Information

6 Months Ended

Jun. 30, 2015

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 June 30, 2015
Earned insurance and reinsurance premiums	$	319.3		$	215.5		$	.6		$	.1		$	1.8		$	537.3
Net investment income	10.1			9.3			.5			.8			3.1			23.8
Net investment income (loss) - surplus note    interest	—			—			3.9			(3.9		)	—			—
Net realized and unrealized investment losses	(14.0		)	(42.7		)	(1.4		)	(1.9		)	(1.1		)	(61.1		)
Other (loss) revenue	(1.2		)	5.4			—			.2			83.1			87.5
Total revenues	314.2			187.5			3.6			(4.7		)	86.9			587.5
Losses and LAE	194.5			92.1			—			—			1.7			288.3
Insurance and reinsurance acquisition expenses	56.4			47.5			.1			.6			.7			105.3
Other underwriting expenses	52.9			27.7			—			.1			—			80.7
General and administrative expenses	4.2			6.8			.4			8.7			88.0			108.1
Interest expense	3.3			6.6			—			—			1.0			10.9
Total expenses	311.3			180.7			.5			9.4			91.4			593.3
Pre-tax income (loss)	$	2.9		$	6.8		$	3.1		$	(14.1	)	$	(4.5	)	$	(5.8	)

							HG Global/BAM
Millions	OneBeacon			Sirius Group			HG			BAM			Other Operations			Total
Six Months Ended June 30, 2015
Earned insurance and reinsurance premiums	$	605.9		$	420.5		$	1.1		$	.3		$	3.8		$	1,031.6
Net investment income	20.6			17.3			.9			1.8			6.5			47.1
Net investment income (loss) - surplus note    interest	—			—			7.9			(7.9		)	—			—
Net realized and unrealized investment gains (loses)	.2			37.2			(.3		)	1.1			4.1			42.3
Other revenue (loss)	(4.3		)	(22.0		)	—			.3			149.3			123.3
Total revenues	622.4			453.0			9.6			(4.4		)	163.7			1,244.3
Losses and LAE	360.4			189.6			—			—			3.7			553.7
Insurance and reinsurance acquisition expenses	107.4			90.1			.2			1.4			1.8			200.9
Other underwriting expenses	108.8			53.2			—			.2			—			162.2
General and administrative expenses	8.3			13.0			.8			16.9			185.5			224.5
Interest expense	6.5			13.4			—			—			2.1			22.0
Total expenses	591.4			359.3			1.0			18.5			193.1			1,163.3
Pre-tax income (loss)	$	31.0		$	93.7		$	8.6		$	(22.9	)	$	(29.4	)	$	81.0

						HG Global/BAM
Millions	OneBeacon		Sirius Group			HG		BAM			Other Operations			Total
Three Months Ended June 30, 2014
Earned insurance and reinsurance premiums	$	290.9	$	209.6		$	.3	$	.1		$	2.5		$	503.4
Net investment income	12.2		11.8			.3		1.4			3.9			29.6
Net investment income (loss) - surplus note    interest	—		—			4.0		(4.0		)	—			—
Net realized and unrealized investment gains	21.9		58.4			.9		3.8			28.9			113.9
Other revenue (loss)	1.0		(19.2		)	—		.1			24.5			6.4
Total revenues	326.0		260.6			5.5		1.4			59.8			653.3
Losses and LAE	186.1		91.4			—		—			5.2			282.7
Insurance and reinsurance acquisition expenses	49.6		48.8			.1		.5			(.1		)	98.9
Other underwriting expenses	51.7		30.2			—		.1			(.1		)	81.9
General and administrative expenses	3.6		6.9			.4		8.8			50.6			70.3
Interest expense	3.3		6.6			—		—			.1			10.0
Total expenses	294.3		183.9			.5		9.4			55.7			543.8
Pre-tax income (loss)	$	31.7	$	76.7		$	5.0	$	(8.0	)	$	4.1		$	109.5

						HG Global/BAM
Millions	OneBeacon		Sirius Group			HG		BAM			Other Operations			Total
Six Months Ended June 30, 2014
Earned insurance and reinsurance premiums	$	567.4	$	425.1		$	.5	$	.2		$	3.8		$	997.0
Net investment income	22.6		20.5			.6		2.8			7.8			54.3
Net investment income (loss) - surplus note    interest	—		—			7.9		(7.9		)	—			—
Net realized and unrealized investment gains	40.8		86.5			1.6		6.8			42.0			177.7
Other revenue (loss)	2.0		(24.5		)	—		.3			25.2			3.0
Total revenues	632.8		507.6			10.6		2.2			78.8			1,232.0
Losses and LAE	335.5		170.2			—		—			6.3			512.0
Insurance and reinsurance acquisition expenses	96.3		96.2			.2		.9			.4			194.0
Other underwriting expenses	101.1		62.0			—		.2			—			163.3
General and administrative expenses	6.9		15.3			.8		17.7			79.9			120.6
Interest expense	6.5		13.2			—		—			.4			20.1
Total expenses	546.3		356.9			1.0		18.8			87.0			1,010.0
Pre-tax income (loss)	$	86.5	$	150.7		$	9.6	$	(16.6	)	$	(8.2	)	$	222.0