Pension and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension Cost

The components of net periodic pension cost for defined benefit pension and other postretirement benefit plans included in the Company’s results of operations are as follows:

	Three Months Ended March 31,
	2019			2018			2019		2018
(in millions)	Pension Plans						Postretirement Plans
Service cost - benefits earned during the period	$	—		$	—		$	—	$	—
Interest cost		5.3			4.9			0.1		0.1
Expected return on plan assets		(5.8	)		(5.2	)		—		—
Recognized net actuarial loss		2.8			2.5			—		0.1
Amortization of prior service cost		—			—			—		(0.1	)
Net periodic pension cost	$	2.3		$	2.2		$	0.1	$	0.1