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Goodwill and Other Intangible Assets
6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

White Mountains has recognized goodwill and other intangible assets at the acquisition date fair values in connection with its purchases of subsidiaries.
During the quarter ended June 30, 2018, White Mountains completed its acquisition of NSM, recognizing $381.9 million of goodwill and other intangible assets, and its acquisition of Fresh Insurance, recognizing $54.3 million of goodwill and other intangible assets, reflecting acquisition date fair values. The relative fair values of goodwill and of the other intangible assets recognized in connection with the acquisitions of NSM and Fresh Insurance had not yet been determined at June 30, 2018.
The following table presents the change in goodwill and other intangible assets:
 
 
Three Months Ended June 30,
 
 
2018
 
2017
Millions
 
Goodwill
 
Other intangible assets
 
Total Goodwill and other intangible assets
 
Goodwill
 
Other intangible assets
 
Total Goodwill and other intangible assets
Beginning balance
 
$
25.9

 
$
33.3

 
$
59.2

 
$
25.9

 
$
17.0

 
$
42.9

Amortization, including foreign currency translation
 

 
(2.6
)
 
(2.6
)
 

 
(2.6
)
 
(2.6
)
Subtotal
 
$
25.9

 
$
30.7

 
$
56.6

 
$
25.9

 
$
14.4

 
$
40.3

Acquisition of businesses
 
 
 
 
 
436.2

 
 
 
 
 

Ending balance
 
 
 
 
 
$
492.8

 
 
 
 
 
$
40.3


 
 
Six Months Ended June 30,
 
 
2018
 
2017
Millions
 
Goodwill
 
Other intangible assets
 
Total Goodwill and other intangible assets
 
Goodwill
 
Other intangible assets
 
Total Goodwill and other intangible assets
Beginning balance
 
$
25.9

 
$
36.2

 
$
62.1

 
$
25.9

 
$
19.3

 
$
45.2

Amortization, including foreign currency translation
 

 
(5.5
)
 
(5.5
)
 

 
(4.9
)
 
(4.9
)
Subtotal
 
$
25.9

 
$
30.7

 
$
56.6

 
$
25.9

 
$
14.4

 
$
40.3

Acquisition of businesses
 
 
 
 
 
436.2

 
 
 
 
 

Ending balance
 
 
 
 
 
$
492.8

 
 
 
 
 
$
40.3


The following table presents the goodwill and other intangible assets as of June 30, 2018 and December 31, 2017:
Millions
 
June 30, 2018
 
December 31, 2017
Goodwill and other intangible assets:
 
 
 
 
NSM
 
$
436.2

 
$

MediaAlpha
 
48.3

 
53.7

Other
 
8.3

 
8.4

Total goodwill and other intangible assets
 
492.8

 
62.1

Goodwill and other intangible assets attributed to non-controlling interests
 
(41.7
)
 
(21.1
)
Goodwill and other intangible assets included in White Mountains’s
common shareholders’ equity
 
$
451.1

 
$
41.0