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Goodwill and Other Intangible Assets
9 Months Ended
Oct. 02, 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 $780.3 million, and $781.2 million as of October 2, 2016 and December 31, 2015, respectively.  The net change in goodwill since December 31, 2015 was attributable to the effects of foreign exchange.

          Acquired intangible assets subject to amortization as of October 2, 2016 and December 31, 2015 were as follows:

 
October 2,2016
  
December 31,2015
 
 
Weighted
Average
Useful Life
(Years)
 
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
 
Accumulated
Amortization
 
   
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
13.8
  
$
199.8
  
$
9.3
 
Technology
  
12
   
18.8
   
3.4
   
18.8
   
2.5
 
Patents and trademarks
  
17
   
6.4
   
4.7
   
6.4
   
4.4
 
Customer relationships
  
30
   
4.5
   
1.2
   
4.5
   
0.6
 
   
28
  
$
229.5
  
$
23.1
  
$
229.5
  
$
16.8
 
 
The weighted average amortization period for acquired intangible assets subject to amortization is approximately 28 years.  Estimated amortization expense is $2.0 million for the remainder of 2016, $7.9 million for 20172020 and $172.9 million thereafter.