Pension and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30,
	2018			2017			2018			2017
(in millions)	Pension Plans						Postretirement Plans
Service cost - benefits earned during the period	$	—		$	—		$	—		$	—
Interest cost		5.9			6.5			0.1			0.1
Expected return on plan assets		(6.8	)		(6.8	)		—			—
Recognized net actuarial loss		2.4			3.8			—			0.1
Amortization of prior service cost		—			—			(0.1	)		(0.4	)
Net periodic pension cost (benefit)	$	1.5		$	3.5		$	—		$	(0.2	)
	Six Months Ended June 30,
	2018			2017			2018			2017
(in millions)	Pension Plans						Postretirement Plans
Service cost - benefits earned during the period	$	—		$	—		$	—		$	—
Interest cost		11.8			12.9			0.2			0.2
Expected return on plan assets		(13.7	)		(13.6	)		—			—
Recognized net actuarial loss		4.9			7.6			0.1			0.1
Amortization of prior service cost		—			—			(0.2	)		(0.7	)
Net periodic pension cost (benefit)	$	3.0		$	6.9		$	0.1		$	(0.4	)