Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2016

Compensation And Retirement Disclosure [Abstract]

Components of Estimated Net Pension and Other Postretirement Benefit Plan Expense (Income)

The components of the estimated net pension and other postretirement benefits plan expense (income) for the three and six months ended June 30, 2016 and 2015 were as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
Pension expense (income)
Service cost	$	0.3		$	0.5		$	0.6		$	1.1
Interest cost		36.8			44.6			73.7			89.4
Expected return on plan assets		(60.9	)		(61.7	)		(121.4	)		(123.3	)
Amortization, net		7.9			10.2			15.7			20.4
Settlement		96.9			—			96.9			—
Net pension expense (income)	$	81.0		$	(6.4	)	$	65.5		$	(12.4	)
Other postretirement benefits plan expense (income)
Service cost	$	1.0		$	1.2		$	2.0		$	2.4
Interest cost		3.1			4.0			6.1			8.0
Expected return on plan assets		(3.4	)		(3.2	)		(6.8	)		(6.5	)
Amortization, net		(4.0	)		(6.8	)		(8.0	)		(13.5	)
Net other postretirement benefits plan income	$	(3.3	)	$	(4.8	)	$	(6.7	)	$	(9.6	)