Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2019

Compensation And Retirement Disclosure [Abstract]

Components of Net Pension and Other Postretirement Benefit Plan (OPEB) Income

Components of net pension and other postretirement benefits plan (“OPEB”) income for the three months ended March 31, 2019 and 2018 were as follows:

	Three Months Ended
	March 31,
	2019			2018
Pension expense (income):
Service cost	$	0.2		$	0.2
Interest cost		8.4			7.8
Expected return on plan assets		(11.6	)		(12.6	)
Amortization, net		1.5			2.0
Settlements		—			0.3
Net pension income	$	(1.5	)	$	(2.3	)
OPEB expense (income):
Service cost	$	—		$	0.4
Interest cost		2.6			2.6
Expected return on plan assets		(3.3	)		(3.5	)
Amortization, net		(1.8	)		(0.7	)
Net OPEB income	$	(2.5	)	$	(1.2	)