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Goodwill and Other Intangible Assets, net
 9 Months Ended
Sep. 30, 2026
Intangible Asset, Goodwill and Other [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, 2026, by segment, were as follows (in millions):
Segment
Utility SolutionsElectrical SolutionsTotal
BALANCE AT DECEMBER 31, 2025$2,384.0 $676.8 $3,060.8 
Prior year acquisitions(1)
3.5 — 3.5 
Current year acquisitions(1)
— 1,303.9 1,303.9 
Foreign currency translation 0.8 (0.8)— 
BALANCE AT SEPTEMBER 30, 2026$2,388.3 $1,979.9 $4,368.2 
 (1) Refer to Note 2 - 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, 2026December 31, 2025
Gross AmountAccumulated
Amortization		Gross AmountAccumulated
Amortization
Definite-lived:
Patents, tradenames and trademarks$315.0 $(114.3)$250.0 $(104.7)
Customer relationships3,424.3 (596.9)1,633.6 (517.6)
Developed technology and other277.7 (196.1)278.6 (179.4)
TOTAL DEFINITE-LIVED INTANGIBLES$4,017.0 $(907.3)$2,162.2 $(801.7)
Indefinite-lived:
Tradenames and other33.7 — 33.8 — 
TOTAL OTHER INTANGIBLE ASSETS$4,050.7 $(907.3)$2,196.0 $(801.7)
 
Amortization expense associated with definite-lived intangible assets was $46.4 million and $24.7 million during the three months ended September 30, 2026 and 2025, respectively, and $106.6 million and $74.0 million during the nine months ended September 30, 2026 and 2025, respectively. Future amortization expense associated with these intangible assets is estimated to be $37.4 million for the remainder of 2026, $172.1 million in 2027, $172.8 million in 2028, $173.1 million in 2029, $169.9 million in 2030, and $166.2 million in 2031. 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 94% of the gross value of definite-lived intangible assets follows an accelerated amortization method.