Pension and Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Components of net periodic benefit cost

The components of net periodic benefit (income) costs recognized during interim periods were as follows:

	Pension Benefits						Postretirement Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
	2018			2017			2018			2017
	(In millions)
Service costs	$	1.0		$	0.6		$	—		$	—
Interest costs	0.5			0.5			0.1			0.1
Expected return on plan assets	(2.9		)	(2.4		)	—			—
Recognized net actuarial loss	0.1			0.2			—			—
Net periodic benefit (income) costs	$	(1.3	)	$	(1.1	)	$	0.1		$	0.1
Weighted average:
Discount rate for PBO	3.52		%	3.91		%	3.32		%	3.63		%
Discount rate for interest cost	3.10		%	3.20		%	2.89		%	2.92		%
Discount rate for service cost	3.57		%	3.98		%	3.70		%	4.12		%
Expected return on plan assets	8.25		%	8.25		%