Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2016

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 September 30,
	2016			2015			2016			2015
Service cost	$	1.2		$	1.4		$	0.3		$	0.4
Interest cost	4.0			3.6			0.4			0.4
Expected return on plan assets (a)	(4.7		)	(5.0		)	—			—
Recognized net actuarial loss	1.6			1.6			0.1			—
Amortization of prior service benefit	0.1			0.1			(0.1		)	(0.1		)
Net periodic benefit cost	$	2.2		$	1.7		$	0.7		$	0.7

	Pension Benefits						Postretirement Benefits Other than Pensions
	Nine Months Ended September 30,
	2016			2015			2016			2015
Service cost	$	3.6		$	4.2		$	0.9		$	1.1
Interest cost	12.0			10.2			1.2			1.2
Expected return on plan assets (a)	(14.2		)	(14.1		)	—			—
Recognized net actuarial loss	4.9			4.7			0.2			0.1
Amortization of prior service benefit	0.2			0.2			(0.2		)	(0.2		)
Net periodic benefit cost	$	6.5		$	5.2		$	2.1		$	2.2

(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.