Pension and Other Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Schedule of net pension and other benefit costs

The following table sets forth the components of net pension and other benefit costs for the three months ended March 31, 2018 and 2017 (in millions):

	Pension Benefits						Other Benefits
	2018			2017			2018			2017
Three Months Ended March 31,
Service cost	$	1.1		$	1.5		$	—		$	—
Interest cost	8.6			9.2			0.2			0.3
Expected return on plan assets	(8.5		)	(8.5		)	—			—
Amortization of prior service cost	—			—			(0.2		)	(0.2		)
Amortization of actuarial losses	2.8			2.8			—			—
NET PERIODIC BENEFIT COST	$	4.0		$	5.0		$	—		$	0.1