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Goodwill and Other Intangible Assets, net
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets, net Goodwill and Other Intangible Assets, net
Changes in the carrying values of goodwill for the nine months ended September 30, 2023, by segment, were as follows (in millions):
 Segment 
 Utility SolutionsElectrical SolutionsTotal
BALANCE AT DECEMBER 31, 2022$1,275.9 $694.6 $1,970.5 
Prior year acquisitions1.2 2.1 3.3 
Current year acquisitions(1)
21.5 — 21.5 
Foreign currency translation (0.2)(0.4)(0.6)
BALANCE AT SEPTEMBER 30, 2023$1,298.4 $696.3 $1,994.7 
 (1) Refer to Note 3 - Business Acquisitions for additional information.

The carrying value of other intangible assets included in Other intangible assets, net in the Condensed Consolidated Balance Sheets is as follows (in millions):
 September 30, 2023December 31, 2022
 Gross AmountAccumulated
Amortization		Gross AmountAccumulated
Amortization
Definite-lived:    
Patents, tradenames and trademarks$190.7 $(82.1)$187.9 $(75.7)
Customer relationships, developed technology and other977.0 (481.3)955.3 (437.8)
TOTAL DEFINITE-LIVED INTANGIBLES$1,167.7 $(563.4)$1,143.2 $(513.5)
Indefinite-lived:  
Tradenames and other40.4 — 40.2 — 
TOTAL OTHER INTANGIBLE ASSETS$1,208.1 $(563.4)$1,183.4 $(513.5)
 
Amortization expense associated with definite-lived intangible assets was $18.4 million and $18.7 million during the three months ended September 30, 2023 and 2022, respectively, and $54.3 million and $53.6 million during the nine months ended September 30, 2023 and 2022, respectively. Future amortization expense associated with these intangible assets is estimated to be $18.5 million for the remainder of 2023, $69.3 million in 2024, $67.1 million in 2025, $63.4 million in 2026, $57.2 million in 2027, and $51.7 million in 2028. The Company amortizes intangible assets with definite lives using either an accelerated method that reflects the pattern in which economic benefits of the intangible assets are consumed and results in higher amortization in the earlier years of the assets useful lives, or using a straight line method. Approximately 80% of the gross value of definite-lived intangible assets follow an accelerated amortization method.