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Goodwill and Other Intangible Assets
3 Months Ended
Apr. 01, 2018
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
Note 7.  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 $779.5 million and $779.3 as of April 1, 2018 and December 31, 2017.
 
Intangible assets subject to amortization as of April 1, 2018 and December 31, 2017 were as follows:

 
 
Weighted
Average Useful
Life (Years)
Apr. 1, 2018
  
Dec. 31, 2017
 
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
     
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
22.1
  
$
199.8
  
$
20.7
 
Technology
  
12
   
18.8
   
5.2
   
18.8
   
4.8
 
Patents and trademarks
  
17
   
6.4
   
5.3
   
6.4
   
5.3
 
Customer relationships
  
30
   
4.5
   
2.4
   
4.5
   
2.2
 
   
28
  
$
229.5
  
$
35.0
  
$
229.5
  
$
33.0
 
 
The weighted average amortization period for acquired intangible assets subject to amortization is approximately 28 years.  Estimated amortization expense is $5.9 million for the remainder of 2018, $31.6 million for 2019-2022, and $157.0 million thereafter.