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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 29, 2015
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 $768.3 million, and $770.9 million as of March 29, 2015 and December 31, 2014, respectively.  The net change in goodwill since December 31, 2014 was attributable to the effect of foreign exchange.
 
Acquired intangible assets subject to amortization were as follows:
 
 
Mar. 29, 2015
  
Dec. 31, 2014
 
  
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
  
(millions of dollars)
 
Tradenames
 
$
191.2
  
$
5.1
  
$
191.2
  
$
3.7
 
Technology
  
18.7
   
1.4
   
18.7
   
1.0
 
Patents and trademarks
  
6.4
   
4.1
   
6.4
   
4.0
 
Customer relationships
  
4.4
   
0.1
   
4.4
   
0.1
 
Customer lists
  
2.9
   
2.7
   
2.9
   
2.7
 
  
$
223.6
  
$
13.4
  
$
223.6
  
$
11.5
 
 
The weighted average amortization period for acquired intangible assets subject to amortization is approximately 28  years. Estimated amortization expense is $7.9 million for 2015–2016, $7.7 million for 2017, $7.5 million for 2018-2020, and $164.2 million thereafter.