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Goodwill and Other Identifiable Intangible Assets
 6 Months Ended
Jun. 30, 2024
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,
2023		Foreign Currency
Translation		June 30,
2024
Flow$767.1 $(19.0)$748.1 
Water Solutions1,400.6 (5.0)1,395.6 
Pool1,106.9 — 1,106.9 
Total goodwill$3,274.6 $(24.0)$3,250.6 
Identifiable intangible assets consisted of the following:
 June 30, 2024December 31, 2023
In millionsCostAccumulated
amortization		NetCostAccumulated
amortization		Net
Definite-life intangibles
Customer relationships$1,100.8 $(381.0)$719.8 $1,106.2 $(361.8)$744.4 
Proprietary technology and patents89.3 (45.8)43.5 89.7 (43.2)46.5 
Total definite-life intangibles
1,190.1 (426.8)763.3 1,195.9 (405.0)790.9 
Indefinite-life intangibles
Trade names249.1 — 249.1 251.5 — 251.5 
Total intangibles$1,439.2 $(426.8)$1,012.4 $1,447.4 $(405.0)$1,042.4 
Identifiable intangible asset amortization expense was $13.4 million and $13.9 million for the three months ended June 30, 2024 and 2023, and $26.9 million and $27.7 million for the six months ended June 30, 2024 and 2023, respectively.
Estimated future amortization expense for identifiable intangible assets during the remainder of 2024 and the next five years is as follows:
 
Q3-Q4
     
202420252026202720282029
Estimated amortization expense$27.0 $54.0 $52.8 $51.5 $49.0 $48.6