Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of components of net periodic benefit cost for defined benefit plans and postretirement plans other than pensions

	Pension Benefits						Postretirement Benefits Other than Pensions
	Three Months Ended March 31,
	2017			2016			2017		2016
Service cost	$	1.3		$	1.2		$	0.3	$	0.3
Interest cost	3.7			4.0			0.4		0.4
Expected return on plan assets (a)	(4.8		)	(4.7		)	—		—
Recognized net actuarial loss	1.9			1.7			—		0.1
Amortization of prior service benefit	0.1			—			—		(0.1		)
Net periodic benefit cost	$	2.2		$	2.2		$	0.7	$	0.7

(a) The expected return on plan assets is determined by multiplying the fair value of plan assets at the prior year-end (adjusted for estimated current year cash benefit payments and contributions) by the expected long-term rate of return.