Pension Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

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

	Pension Benefits												Other Postretirement Benefits (OPEB)
	Three Months Ended June 30,						Six Months Ended June 30,						Three Months Ended June 30,				Six Months Ended June 30,
	2016			2015			2016			2015			2016		2015		2016		2015
	(In millions)
Service costs	$	0.6		$	0.6		$	1.2		$	1.2		$	—	$	—	$	—	$	—
Interest costs	0.4			0.6			0.9			1.2			0.1		0.2		0.2		0.3
Expected return on plan assets	(2.4		)	(2.5		)	(4.8		)	(5.0		)	—		—		—		—
Recognized net actuarial loss	0.3			—			0.6			—			0.1		0.1		0.2		0.3
Net periodic benefit (income) costs	$	(1.1	)	$	(1.3	)	$	(2.1	)	$	(2.6	)	$	0.2	$	0.3	$	0.4	$	0.6