Employee Benefit Plans (Tables)

6 Months Ended

Jun. 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 June 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		1.2
Expected Return on Plan Assets	(22.8)		(23.1)		(2.1)		(2.1)		(0.1)		(0.1)
Amortization of:
Net Actuarial (Gain) Loss	3.6		3.8		0.7		0.7		(0.4)		(2.7)
Total Net Periodic Benefit Cost (Credit)	$	3.8	$	5.0	$	0.5	$	0.5	$	0.5	$	(1.6)

	Six Months Ended June 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2024		2023		2024		2023		2024		2023
	(in millions of dollars)
Service Cost	$	4.6	$	4.6	$	—	$	—	$	—	$	—
Interest Cost	41.4		44.0		3.8		3.8		2.0		2.3
Expected Return on Plan Assets	(45.6)		(46.1)		(4.2)		(4.2)		(0.2)		(0.2)
Amortization of:
Net Actuarial (Gain) Loss	7.3		7.6		1.5		1.3		(0.6)		(5.3)
Prior Service Credit	—		—		—		—		(0.1)		(0.1)
Total Net Periodic Benefit Cost (Credit)	$	7.7	$	10.1	$	1.1	$	0.9	$	1.1	$	(3.3)