Retirement Plans

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2021 and 2020 were as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2021			2020			2021			2020
Pension income:
Service cost	$	0.3		$	0.2		$	0.6		$	0.5
Interest cost		5.1			6.8			10.2			13.7
Expected return on plan assets		(9.6	)		(10.0	)		(19.1	)		(20.2	)
Amortization, net		3.0			2.5			5.9			5.0
Net pension income	$	(1.2	)	$	(0.5	)	$	(2.4	)	$	(1.0	)
OPEB income:
Interest cost		1.0			1.8			2.1			3.6
Expected return on plan assets		(2.9	)		(3.1	)		(5.9	)		(6.3	)
Amortization, net		(1.7	)		(1.5	)		(3.2	)		(3.0	)
Net OPEB income	$	(3.6	)	$	(2.8	)	$	(7.0	)	$	(5.7	)

During the six months ended June 30, 2021 and 2020, we contributed $2.6 million and $4.2 million, respectively, to our retirement plans.