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Goodwill and other identifiable intangible assets
 6 Months Ended
Jun. 28, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other identifiable intangible assets Goodwill and other identifiable intangible assets
Changes in goodwill during the first two quarters ended June 28, 2020, were as follows:
In millionsGas CylindersElektronTotal
At January 1, 2020$27.0  $41.8  $68.8  
Exchange difference(1.5) (0.9) (2.4) 
Balance at June 28, 2020$25.5  $40.9  $66.4  
Identifiable intangible assets consisted of the following:
June 28, 2020December 31, 2019
In millionsGrossAccumulated amortizationNetGrossAccumulated amortizationNet
Customer relationships$13.4  $(4.9) $8.5  $13.4  $(4.6) $8.8  
Technology and trading related7.6  (3.3) 4.3  8.1  (3.3) 4.8  
$21.0  $(8.2) $12.8  $21.5  $(7.9) $13.6  
Identifiable intangible asset amortization expense was $0.4 million and $0.6 million for the first two quarters of 2020 and 2019 respectively.
Intangible asset amortization expense during the remainder of 2020 and over the next five years is expected to be approximately $0.3 million in 2020, $0.7 million in 2021, $0.7 million in 2022, $0.7 million in 2023, $0.7 million in 2024 and $0.7 million in 2025.