Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Net Periodic Benefit Cost

Components of net periodic benefit cost for the three months endedMarch 31, 2018 and 2017 were as follows:

	Pension and Other Postretirement Benefits
	Three Months Ended
	March 31,
(In millions)	2018			2017
Service cost	$	5.0		$	5.0
Interest cost	3.6			3.7
Expected return on plan assets	(3.6		)	(3.5		)
Amortization of prior service costs	0.1			0.1
Recognized net actuarial losses	—			0.2
Net periodic benefit cost	$	5.1		$	5.5