Retirement Plans

6 Months Ended

Jun. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Retirement Plans

7. Retirement Plans

Components of net pension and other postretirement benefits plan (“OPEB”) income for the three and six months ended June 30, 2019 and 2018 were as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019			2018			2019			2018
Pension expense (income):
Service cost	$	0.3		$	0.2		$	0.5		$	0.4
Interest cost		8.3			7.9			16.7			15.7
Expected return on plan assets		(11.6	)		(12.6	)		(23.2	)		(25.2	)
Amortization, net		1.5			1.9			3.0			3.9
Settlements		—			1.0			—			1.3
Net pension income	$	(1.5	)	$	(1.6	)	$	(3.0	)	$	(3.9	)
OPEB expense (income):
Service cost	$	—		$	0.4		$	—		$	0.8
Interest cost		2.4			2.6			5.0			5.2
Expected return on plan assets		(3.3	)		(3.5	)		(6.6	)		(7.0	)
Amortization, net		(1.7	)		(0.7	)		(3.5	)		(1.4	)
Net OPEB income	$	(2.6	)	$	(1.2	)	$	(5.1	)	$	(2.4	)

During the six months ended June 30, 2019, we contributed $3.8 million to our retirement plans.