Retirement Plans

9 Months Ended

Sep. 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 nine months ended September 30, 2021 and 2020 were as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2021			2020			2021			2020
Pension income:
Service cost	$	0.3		$	0.2		$	0.9		$	0.7
Interest cost		5.1			6.8			15.3			20.5
Expected return on plan assets		(9.6	)		(10.2	)		(28.7	)		(30.4	)
Amortization, net		2.9			2.5			8.8			7.5
Net pension income	$	(1.3	)	$	(0.7	)	$	(3.7	)	$	(1.7	)
OPEB income:
Interest cost		1.1			1.9			3.2			5.5
Expected return on plan assets		(3.0	)		(3.1	)		(8.9	)		(9.4	)
Amortization, net		(1.5	)		(1.5	)		(4.7	)		(4.5	)
Net OPEB income	$	(3.4	)	$	(2.7	)	$	(10.4	)	$	(8.4	)

During the nine months ended September 30, 2021 and 2020, we contributed $3.6 million and $6.3 million, respectively, to our retirement plans.