Goodwill and Other Identifiable Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Amount of Goodwill by Segment

The changes in the carrying amount of goodwill by reportable segment were as follows:

In millions	December 31, 2025		Acquisitions/ divestitures		Foreign currency translation/other		March 31, 2026
Systems Protection	$	1,202.4	$	0.4	$	(2.8)	$	1,200.0
Electrical Connections	1,475.6		(0.1)		—		1,475.5
Total goodwill	$	2,678.0	$	0.3	$	(2.8)	$	2,675.5

Schedule of Finite-Lived Intangible Assets

Identifiable intangible assets consisted of the following:

	March 31, 2026						December 31, 2025
In millions	Cost		Accumulated amortization		Net		Cost		Accumulated amortization		Net
Definite-life intangibles
Customer relationships	$	1,902.9	$	(575.2)	$	1,327.7	$	1,904.0	$	(551.5)	$	1,352.5
Proprietary technologies and patents	111.9		(35.3)		76.6		111.8		(31.8)		80.0
Other definite-lived intangible assets	139.5		(76.7)		62.8		139.5		(63.1)		76.4
Total definite-life intangibles	2,154.3		(687.2)		1,467.1		2,155.3		(646.4)		1,508.9
Indefinite-life intangibles
Trade names	367.6		—		367.6		367.6		—		367.6
Total intangibles	$	2,521.9	$	(687.2)	$	1,834.7	$	2,522.9	$	(646.4)	$	1,876.5

Schedule of Indefinite-Lived Intangible Assets

Identifiable intangible assets consisted of the following:

	March 31, 2026						December 31, 2025
In millions	Cost		Accumulated amortization		Net		Cost		Accumulated amortization		Net
Definite-life intangibles
Customer relationships	$	1,902.9	$	(575.2)	$	1,327.7	$	1,904.0	$	(551.5)	$	1,352.5
Proprietary technologies and patents	111.9		(35.3)		76.6		111.8		(31.8)		80.0
Other definite-lived intangible assets	139.5		(76.7)		62.8		139.5		(63.1)		76.4
Total definite-life intangibles	2,154.3		(687.2)		1,467.1		2,155.3		(646.4)		1,508.9
Indefinite-life intangibles
Trade names	367.6		—		367.6		367.6		—		367.6
Total intangibles	$	2,521.9	$	(687.2)	$	1,834.7	$	2,522.9	$	(646.4)	$	1,876.5

Estimated Future Amortization Expense for Identifiable Intangible Assets

Estimated future amortization expense for identifiable intangible assets during the remainder of 2026 and the next five years is as follows:

	Q2-Q4
In millions	2026		2027		2028		2029		2030		2031
Estimated amortization expense	$	112.7	$	136.3	$	111.0	$	111.0	$	107.8	$	105.6