Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2026

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The following table provides the components of the net periodic benefit cost for the defined benefit pension and OPEB plans.

	Three Months Ended June 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2026		2025		2026		2025		2026		2025
	(in millions of dollars)
Service Cost	$	2.0	$	2.3	$	—	$	—	$	—	$	—
Interest Cost	16.4		21.4		2.2		2.2		0.9		1.0
Expected Return on Plan Assets	(16.7)		(21.8)		(2.5)		(2.2)		(0.1)		(0.1)
Amortization of:
Net Actuarial Loss (Gain)	2.1		3.7		0.7		0.7		(0.3)		(0.3)
Total Net Periodic Benefit Cost	$	3.8	$	5.6	$	0.4	$	0.7	$	0.5	$	0.6

	Six Months Ended June 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2026		2025		2026		2025		2026		2025
	(in millions of dollars)
Service Cost	$	3.8	$	4.7	$	—	$	—	$	—	$	—
Interest Cost	32.8		42.8		4.4		4.3		1.8		2.0
Expected Return on Plan Assets	(33.4)		(43.6)		(5.0)		(4.4)		(0.2)		(0.2)
Amortization of:
Net Actuarial Loss (Gain)	4.3		7.4		1.4		1.4		(0.5)		(0.6)
Prior Service Credit	—		—		—		—		(0.1)		(0.1)
Total Net Periodic Benefit Cost	$	7.5	$	11.3	$	0.8	$	1.3	$	1.0	$	1.1