Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 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 March 31
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2026		2025		2026		2025		2026		2025
	(in millions of dollars)
Service Cost	$	1.8	$	2.4	$	—	$	—	$	—	$	—
Interest Cost	16.4		21.4		2.2		2.1		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)	2.2		3.7		0.7		0.7		(0.2)		(0.3)
Prior Service Credit	—		—		—		—		(0.1)		(0.1)
Total Net Periodic Benefit Cost	$	3.7	$	5.7	$	0.4	$	0.6	$	0.5	$	0.5