Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016						December 31, 2015
$ in millions	Weighted Average Economic life (in years)	Acquisition date fair value		Accumulated amortization		Net carrying value		Acquisition date fair value		Accumulated amortization		Net carrying value
Goodwill:
MediaAlpha	N/A	$	18.3	$	—	$	18.3	$	18.3	$	—	$	18.3
Wobi	N/A	5.8		—		5.8		5.8		—		5.8
Buzzmove	N/A	7.6		—		7.6		—		—		—
Total goodwill		31.7		—		31.7		24.1		—		24.1

Other intangible assets:
MediaAlpha
Customer relationships	3	10.0		6.2		3.8		6.5		2.9		3.6
Information technology	5	32.4		17.9		14.5		32.0		11.2		20.8
Subtotal		42.4		24.1		18.3		38.5		14.1		24.4

Wobi
Trademark	8	2.1		.8		1.3		2.1		.5		1.6
Information technology	7	3.6		1.2		2.4		3.6		.7		2.9
Subtotal		5.7		2.0		3.7		5.7		1.2		4.5

Buzzmove
Trademark	7	.6		.1		.5		—		—		—
Information technology	5	.5		—		.5		—		—		—
Subtotal		1.1		.1		1.0		—		—		—

OneBeacon	10	9.4		8.2		1.2		9.4		7.0		2.4

Total other intangible assets		58.6		34.4		24.2		53.6		22.3		31.3
Total goodwill and other intangible assets⁽¹⁾		$	90.3	$	34.4	$	55.9	$	77.7	$	22.3	$	55.4

Schedule of Goodwill and Intangible Assets Rollforward

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



	December 31,
	2016					2015
Millions	Goodwill		Other intangible assets			Goodwill		Other intangible assets
Beginning balance	$	24.1	$	31.3		$	23.8	$	38.7
Add: Star & Shield amounts held for sale at beginning of the period ⁽¹⁾	—		.4			—		.8
Acquisitions of businesses	7.6		1.1			.3		2.8
Acquisitions of other intangible assets	—		3.9			—		—
Amortization, including foreign currency translation	—		(12.5		)	—		(10.6		)
Less: Star & Shield amounts held for sale at end of the period⁽¹⁾	—		—			—		.4
Ending balance	$	31.7	$	24.2		$	24.1	$	31.3

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
2017	$	10.9
2018	8.3
2019	2.3
2020	.7
2021	.9
Total	$	23.1