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Goodwill and Other Intangible Assets
9 Months Ended
Oct. 01, 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 $779.6 million and $778.7 million as of October 1, 2017 and December 31, 2016, respectively.  The net change in goodwill since December 31, 2016 was attributable to the effects of foreign exchange.

Acquired intangible assets subject to amortization as of October 1, 2017 and December 31, 2016 were as follows:

     
Oct. 1, 2017
  
Dec. 31, 2016
 
  
Weighted
Average
Useful Life
(Years)
  
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
     
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
19.4
  
$
199.8
  
$
15.3
 
Technology
  
12
   
18.8
   
4.5
   
18.8
   
3.6
 
Patents and trademarks
  
17
   
6.4
   
5.2
   
6.4
   
4.8
 
Customer relationships
  
30
   
4.5
   
2.0
   
4.5
   
1.4
 
   
28
  
$
229.5
  
$
31.1
  
$
229.5
  
$
25.1
 

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 2017, $7.9 million per year for 2018–2021 and $164.8 million thereafter.