Retirement Plans

3 Months Ended

Mar. 31, 2021

Compensation And Retirement Disclosure [Abstract]

Retirement Plans

8. Retirement Plans

Components of net pension and other postretirement benefits plan (“OPEB”) income for the three months ended March 31, 2021 and 2020 were as follows:

	Three Months Ended
	March 31,
	2021			2020
Pension income:
Service cost	$	0.3		$	0.3
Interest cost		5.1			6.9
Expected return on plan assets		(9.5	)		(10.2	)
Amortization, net		2.9			2.5
Net pension income	$	(1.2	)	$	(0.5	)
OPEB income:
Interest cost		1.1			1.8
Expected return on plan assets		(3.0	)		(3.2	)
Amortization, net		(1.5	)		(1.5	)
Net OPEB income	$	(3.4	)	$	(2.9	)

During the three months ended March 31, 2021 and 2020, we contributed $1.9 million and $4.0 million, respectively, to our retirement plans.