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Goodwill and Other Identifiable Intangible Assets
 12 Months Ended
Dec. 31, 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 for the years ended December 31, 2020 and 2019 by reportable segment were as follows:
In millionsDecember 31, 2019Acquisitions/
divestitures		Purchase accounting adjustmentsForeign 
currency
translation		December 31, 2020
Consumer Solutions$1,501.4 $51.9 $14.4 $12.8 $1,580.5 
Industrial & Flow Technologies756.9 — — 54.8 811.7 
Total goodwill$2,258.3 $51.9 $14.4 $67.6 $2,392.2 

In millionsDecember 31, 2018Acquisitions/
divestitures		Foreign currency
translation		December 31, 2019
Consumer Solutions$1,302.8 $201.8 $(3.2)$1,501.4 
Industrial & Flow Technologies769.9 — (13.0)756.9 
Total goodwill$2,072.7 $201.8 $(16.2)$2,258.3 

There has been no impairment of goodwill for any of the years presented.
Identifiable intangible assets consisted of the following at December 31:
  
20202019
In millionsCostAccumulated
amortization		NetCostAccumulated
amortization		Net
Definite-life intangibles
Customer relationships$435.9 $(308.1)$127.8 $418.1 $(269.1)$149.0 
Proprietary technology and patents
46.9 (29.4)17.5 42.3 (25.5)16.8 
Total finite-life intangibles482.8 (337.5)145.3 460.4 (294.6)165.8 
Indefinite-life intangibles
Trade names180.6 — 180.6 173.4 — 173.4 
Total intangibles$663.4 $(337.5)$325.9 $633.8 $(294.6)$339.2 

Identifiable intangible asset amortization expense in 2020, 2019 and 2018 was $28.4 million, $31.7 million and $34.9 million, respectively.
There was no impairment charge for intangible assets in any of the years presented.
Estimated future amortization expense for identifiable intangible assets during the next five years is as follows:
In millions20212022202320242025
Estimated amortization expense$23.9 $16.6 $13.9 $13.3 $13.3