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Goodwill and Other Identifiable Intangible Assets
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Identifiable Intangible Assets Goodwill and Other Identifiable Intangible Assets
The changes in the carrying amount of goodwill by reportable segment were as follows:
In millionsDecember 31,
2019		Acquisitions/
divestitures		Foreign currency 
translation/other 		June 30,
2020
Enclosures$315.4  $5.6  $0.4  $321.4  
Thermal Management925.5  —  (1.6) 923.9  
Electrical & Fastening Solutions1,038.2  13.8  —  1,052.0  
Total goodwill$2,279.1  $19.4  $(1.2) $2,297.3  
Identifiable intangible assets consisted of the following:
 June 30, 2020December 31, 2019
In millionsCostAccumulated amortizationNetCostAccumulated
amortization		Net
Definite-life intangibles
Customer relationships$1,207.0  $(356.9) $850.1  $1,197.9  $(326.1) $871.8  
Proprietary technology and patents16.3  (8.1) 8.2  14.8  (7.4) 7.4  
Total definite-life intangibles1,223.3  (365.0) 858.3  1,212.7  (333.5) 879.2  
Indefinite-life intangibles
Trade names281.3  —  281.3  281.3  —  281.3  
Total intangibles$1,504.6  $(365.0) $1,139.6  $1,494.0  $(333.5) $1,160.5  

Identifiable intangible asset amortization expense was $16.0 million and $15.1 million for the three months ended June 30, 2020 and 2019, respectively and $32.0 million and $30.2 million for the six months ended June 30, 2020 and 2019, respectively.
Estimated future amortization expense for identifiable intangible assets during the remainder of 2020 and the next five years is as follows:
 Q3-Q4     
In millions202020212022202320242025
Estimated amortization expense$32.0  $63.0  $62.9  $62.7  $62.1  $62.1