Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill

The following table shows the economic lives, acquisition date values, accumulated amortization and net carrying values for other intangible assets and goodwill, for each company acquired:

$ in millions	Weighted Average Economic  life (in years)	December 31, 2015						December 31, 2014
		Acquisition date fair value		Accumulated amortization		Net carrying value		Acquisition date fair value		Accumulated amortization		Net carrying value
Tranzact:
Domain and trade names	7	$	30.5	$	5.4	$	25.1	$	25.6	$	.9	$	24.7
Customer relationships	11	132.3		13.1		119.2		107.5		2.1		105.4
Information technology	6	12.7		2.8		9.9		12.7		.5		12.2
Other	8	2.0		.1		1.9		.5		—		.5
Subtotal		177.5		21.4		156.1		146.3		3.5		142.8
MediaAlpha:
Customer relationships	4	6.5		2.9		3.6		6.5		1.2		5.3
Information technology	5	32.0		11.2		20.8		32.0		4.8		27.2
Subtotal		38.5		14.1		24.4		38.5		6.0		32.5
Wobi:
Trademark	8	2.1		.5		1.6		2.1		.2		1.9
Information technology	7	3.6		.7		2.9		.8		.2		.6
Subtotal		5.7		1.2		4.5		2.9		.4		2.5
Star & Shield:
Customer relationships	3	1.2		.8		.4		1.2		.4		.8
OneBeacon (EBI)	10	9.4		7.0		2.4		9.4		5.7		3.7
Total other intangible assets		232.3		44.5		187.8		198.3		16.0		182.3
Goodwill:
Tranzact	N/A	163.8		—		163.8		145.1		—		145.1
Quote Lab	N/A	18.3		—		18.3		18.3		—		18.3
Wobi	N/A	5.8		—		5.8		5.5		—		5.5
Total goodwill		187.9		—		187.9		168.9		—		168.9
Total goodwill and other intangible assets		$	420.2	$	44.5	$	375.7	$	367.2	$	16.0	$	351.2

Schedule of Goodwill and Intangible Assets Rollforward

The following table shows the change in goodwill and other intangible assets:

	December 31,
Millions	2015					2014
	Goodwill		Other intangible assets			Goodwill		Other intangible assets
Beginning balance	$	168.9	$	182.3		$	—	$	5.1
Acquisitions of businesses	19.0		34.0			168.9		188.9
Dispositions of businesses	—		—			—		—
Amortization, including foreign currency translation	—		(28.5		)	—		(11.7		)
Ending balance	$	187.9	$	187.8		$	168.9	$	182.3

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

White Mountains expects to recognize amortization expense in each of the next five years as follows:

Millions	Amortization expense
2016	$	30.4
2017	29.6
2018	27.2
2019	19.4
2020	16.1
Total	$	122.7