Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

The components of the net periodic benefit cost for our plans were as follows:

	3 Months Ended March 31,
	Defined Benefit Pension Plans						Retiree Health Care Plan
	2017			2016			2017			2016
Service cost	$	2.4		$	1.6		$	—		$	—
Interest cost	2.7			3.0			0.1			0.2
Expected return on assets	(2.6		)	(2.9		)	—			—
Other	0.6			0.3			(0.1		)	(0.2		)
Total benefit cost	$	3.1		$	2.0		$	—		$	—