Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2018

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 and nine months ended September 30, 2018 and 2017 were as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Pension expense (income):
Service cost	$	0.1		$	0.1		$	0.5		$	0.5
Interest cost		7.7			8.0			23.4			23.7
Expected return on plan assets		(12.4	)		(12.7	)		(37.6	)		(37.6	)
Amortization, net		2.0			1.9			5.9			5.4
Settlements		0.2			—			1.5			—
Net pension income	$	(2.4	)	$	(2.7	)	$	(6.3	)	$	(8.0	)
OPEB expense (income):
Service cost	$	(0.3	)	$	0.4		$	0.5		$	1.0
Interest cost		2.5			2.7			7.7			8.3
Expected return on plan assets		(3.5	)		(3.4	)		(10.5	)		(10.1	)
Amortization, net		(0.8	)		(0.7	)		(2.2	)		(2.2	)
Other		(5.1	)		—			(5.1	)		—
Net other postretirement benefit income	$	(7.2	)	$	(1.0	)	$	(9.6	)	$	(3.0	)