Benefit Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2023

Benefit Plans and Other Postretirement Benefits

Schedule of components of net pension expense

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Service cost	$	1.8	$	1.5	$	3.7	$	3.0
Interest cost		6.5		3.5		13.0		7.1
Expected return on plan assets		(7.3)		(7.5)		(14.6)		(15.0)
Amortization of prior service cost		0.5		0.4		0.9		0.7
Amortization of net actuarial losses		0.5		4.0		1.1		8.1
Net pension expense	$	2.0	$	1.9	$	4.1	$	3.9