Pension and Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2017

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 June 30,						Six Months Ended June 30,						Three Months Ended June 30,				Six Months Ended June 30,
	2017			2016			2017			2016			2017		2016		2017			2016
	(In millions)
Service costs	$	0.7		$	0.6		$	1.3		$	1.2		$	—	$	—	$	—		$	—
Interest costs	0.4			0.4			0.9			0.9			—		0.1		0.1			0.2
Expected return on plan assets	(2.4		)	(2.4		)	(4.8		)	(4.8		)	—		—		—			—
Recognized net actuarial loss	0.3			0.3			0.6			0.6			0.1		0.1		0.1			0.2
Net periodic benefit (income) costs	$	(1.0	)	$	(1.1	)	$	(2.0	)	$	(2.1	)	$	0.1	$	0.2	$	0.2		$	0.4
Weighted average:
Discount rate							3.91		%	4.13		%					3.63		%	3.80		%
Expected return on plan assets							8.25		%	8.25		%