Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2023

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
	2023		2022		2023		2022		2023		2022
	(in millions of dollars)
Service Cost	$	2.3	$	1.9	$	—	$	—	$	—	$	—
Interest Cost	22.0		16.8		1.9		1.2		1.1		0.8
Expected Return on Plan Assets	(23.0)		(26.5)		(2.1)		(2.6)		(0.2)		(0.2)
Amortization of:
Net Actuarial (Gain) Loss	3.8		4.1		0.6		0.1		(2.6)		(0.2)
Prior Service Credit	—		—		—		—		—		(0.1)
Total Net Periodic Benefit Cost (Credit)	$	5.1	$	(3.7)	$	0.4	$	(1.3)	$	(1.7)	$	0.3

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2023		2022		2023		2022		2023		2022
	(in millions of dollars)
Service Cost	$	6.9	$	5.8	$	—	$	—	$	—	$	—
Interest Cost	66.0		50.4		5.7		3.8		3.4		2.3
Expected Return on Plan Assets	(69.1)		(79.5)		(6.3)		(8.3)		(0.4)		(0.4)
Amortization of:
Net Actuarial (Gain) Loss	11.4		12.2		1.9		0.3		(7.9)		(0.7)
Prior Service Credit	—		—		—		—		(0.1)		(0.2)
Total Net Periodic Benefit Cost (Credit)	$	15.2	$	(11.1)	$	1.3	$	(4.2)	$	(5.0)	$	1.0