Pension Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

The components of net periodic benefit (gains) 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,
	2015			2014			2015			2014			2015		2014		2015		2014
	(In millions)
Service costs	$	0.6		$	0.5		$	1.2		$	1.1		$	—	$	—	$	—	$	—
Interest costs	0.6			0.6			1.2			1.2			0.2		0.1		0.3		0.3
Expected return on plan assets	(2.5		)	(2.5		)	(5.0		)	(5.1		)	—		—		—		—
Recognized net actuarial loss	—			—			—			—			0.1		0.3		0.3		0.4
Net periodic benefit (gains) costs	$	(1.3	)	$	(1.4	)	$	(2.6	)	$	(2.8	)	$	0.3	$	0.4	$	0.6	$	0.7