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Goodwill and Other Intangible Assets
3 Months Ended
Apr. 02, 2017
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 $778.7 million as of April 2, 2017 and December 31, 2016.
 
Intangible assets subject to amortization as of April 2, 2017 and December 31, 2016 were as follows:

    Weighted
Average Useful
Life (Years)
  
Apr. 2, 2017
  
Dec. 31, 2016
 
  
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
     
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
16.7
  
$
199.8
  
$
15.3
 
Technology
  
12
   
18.8
   
3.9
   
18.8
   
3.6
 
Patents and trademarks
  
17
   
6.4
   
4.9
   
6.4
   
4.8
 
Customer relationships
  
30
   
4.5
   
1.6
   
4.5
   
1.4
 
   
28
  
$
229.5
  
$
27.1
  
$
229.5
  
$
25.1
 

The weighted average amortization period for intangible assets subject to amortization is approximately 28 years.  Estimated amortization expense is $5.9 million for the remainder of 2017, $7.9 million for 2018-2021, and $164.9 million thereafter.