Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2024

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

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

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2024		2023		2024		2023		2024		2023
	(in millions of dollars)
Service Cost	$	2.3	$	2.3	$	—	$	—	$	—	$	—
Interest Cost	20.7		22.0		1.9		1.9		1.0		1.1
Expected Return on Plan Assets	(22.8)		(23.0)		(2.1)		(2.1)		(0.1)		(0.2)
Amortization of:
Net Actuarial (Gain) Loss	3.7		3.8		0.7		0.6		(0.2)		(2.6)
Prior Service Credit	—		—		—		—		(0.1)		—
Total Net Periodic Benefit Cost (Credit)	$	3.9	$	5.1	$	0.5	$	0.4	$	0.6	$	(1.7)

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2024		2023		2024		2023		2024		2023
	(in millions of dollars)
Service Cost	$	6.9	$	6.9	$	—	$	—	$	—	$	—
Interest Cost	62.1		66.0		5.7		5.7		3.0		3.4
Expected Return on Plan Assets	(68.4)		(69.1)		(6.3)		(6.3)		(0.3)		(0.4)
Amortization of:
Net Actuarial (Gain) Loss	11.0		11.4		2.2		1.9		(0.8)		(7.9)
Prior Service Credit	—		—		—		—		(0.2)		(0.1)
Total Net Periodic Benefit Cost (Credit)	$	11.6	$	15.2	$	1.6	$	1.3	$	1.7	$	(5.0)