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Goodwill and Other Intangible Assets
3 Months Ended
Apr. 03, 2016
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
Note 6.Goodwill and Other Intangible Assets

Goodwill and other intangible assets with indefinite lives are not amortized, but instead are assessed for impairment, at least annually.  The carrying amount of goodwill was $781.3 million, and $781.2 million as of April 3, 2016 and December 31, 2015, respectively.  The net change in goodwill since December 31, 2015 was attributable to the effect of foreign exchange.

Acquired intangible assets subject to amortization as of April 3, 2016 and December 31, 2015 were as follows:

 
Apr. 3, 2016
  
Dec. 31, 2015
 
  
Gross
Carrying
Amount
  
 
Accumulated
Amortization
  
Gross
Carrying
Amount
  
 
Accumulated
Amortization
 
  
(millions of dollars)
 
Tradenames
 
$
199.8
  
$
10.8
  
$
199.8
  
$
9.3
 
Technology
  
18.8
   
2.8
   
18.8
   
2.5
 
Patents and trademarks
  
6.4
   
4.5
   
6.4
   
4.4
 
Customer relationships
  
4.5
   
0.8
   
4.5
   
0.6
 
  
$
229.5
  
$
18.9
  
$
229.5
  
$
16.8
 

 The weighted average amortization period for acquired intangible assets subject to amortization is approximately 28 years.  Estimated amortization expense is $8.1 million for 2016, $7.9 million for 2017-2020, and $172.9 million thereafter.