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Goodwill and Other Identifiable Intangible Assets
 9 Months Ended
Sep. 30, 2021
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,
2020		Purchase Accounting AdjustmentsAcquisitionsForeign currency 
translation/other 		September 30,
2021
Consumer Solutions$1,580.5 $(1.2)$29.0 $(6.0)$1,602.3 
Industrial & Flow Technologies811.7 — — (27.5)784.2 
Total goodwill$2,392.2 $(1.2)$29.0 $(33.5)$2,386.5 
Identifiable intangible assets consisted of the following:
 September 30,
2021		December 31,
2020
In millionsCostAccumulated
amortization		NetCostAccumulated
amortization		Net
Definite-life intangibles
Customer relationships$465.3 $(318.0)$147.3 $435.9 $(308.1)$127.8 
Proprietary technology and patents46.6 (31.4)15.2 46.9 (29.4)17.5 
Total definite-life intangibles511.9 (349.4)162.5 482.8 (337.5)145.3 
Indefinite-life intangibles
Trade names177.1 — 177.1 180.6 — 180.6 
Total intangibles$689.0 $(349.4)$339.6 $663.4 $(337.5)$325.9 
Identifiable intangible asset amortization expense was $6.0 million and $6.9 million for the three months ended September 30, 2021 and 2020, respectively, and $19.4 million and $21.5 million for the nine months ended September 30, 2021 and 2020, respectively.
Estimated future amortization expense for identifiable intangible assets during the remainder of 2021 and the next five years is as follows:
 Q4     
202120222023202420252026
Estimated amortization expense$5.8 $17.6 $15.4 $14.9 $14.9 $13.5