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Goodwill and Other Identifiable Intangible Assets
 6 Months Ended
Jun. 30, 2023
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,
2022		Purchase Accounting AdjustmentsForeign Currency
Translation		June 30,
2023
Industrial & Flow Technologies$747.6 $— $10.9 $758.5 
Water Solutions1,398.1 0.5 1.5 1,400.1 
Pool1,106.9 — — 1,106.9 
Total goodwill$3,252.6 $0.5 $12.4 $3,265.5 
Identifiable intangible assets consisted of the following:
 June 30,
2023		December 31,
2022
In millionsCostAccumulated
amortization		NetCostAccumulated
amortization		Net
Definite-life intangibles
Customer relationships$1,103.2 $(335.2)$768.0 $1,100.9 $(308.9)$792.0 
Proprietary technology and patents89.4 (39.4)50.0 89.3 (35.6)53.7 
Other— — — 14.4 (14.4)— 
Total definite-life intangibles1,192.6 (374.6)818.0 1,204.6 (358.9)845.7 
Indefinite-life intangibles
Trade names250.4 — 250.4 248.9 — 248.9 
Total intangibles$1,443.0 $(374.6)$1,068.4 $1,453.5 $(358.9)$1,094.6 
Identifiable intangible asset amortization expense was $13.9 million and $6.3 million for the three months ended June 30, 2023 and 2022 and $27.7 million and $12.9 million for the six months ended June 30, 2023 and 2022, respectively.
Estimated future amortization expense for identifiable intangible assets during the remainder of 2023 and the next five years is as follows:
 Q3-Q4     
202320242025202620272028
Estimated amortization expense$27.3 $54.1 $54.1 $52.8 $51.5 $49.0