Retirement and Postretirement Benefit Plans

6 Months Ended

Jun. 30, 2012

Compensation and Retirement Disclosure [Abstract]

Retirement and Postretirement Benefit Plans

Retirement and Postretirement Benefit Plans

The following table sets forth the net periodic benefit cost for the Company’s defined benefit pension and postretirement benefit plans. The amounts for the three months and six months ended June 30, 2012 are based on updated actuarial calculations prepared during the second quarter of 2012. The net periodic benefit cost recorded for the three months and six months ended June 30, 2012 is the Company’s best estimate of each period’s proportionate share of the amounts to be recorded for the year ending December 31, 2012.

	Pension						Postretirement
	Three Months Ended June 30,						Three Months Ended June 30,
	2012			2011			2012			2011
Components of net periodic benefit cost
Service cost	$	8.4		$	7.9		$	0.5		$	0.7
Interest cost	37.8			39.6			6.7			7.5
Expected return on plan assets	(55.3		)	(57.5		)	(2.5		)	(1.5		)
Amortization of prior service cost (credit)	2.4			2.3			—			0.2
Amortization of net actuarial loss	20.5			15.2			0.2			0.5
Curtailment loss	10.7			—			—			—
Net periodic benefit cost	$	24.5		$	7.5		$	4.9		$	7.4

	Pension						Postretirement
	Six Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Components of net periodic benefit cost
Service cost	$	17.2		$	16.2		$	1.2		$	1.2
Interest cost	75.6			79.4			13.9			16.2
Expected return on plan assets	(110.5		)	(107.6		)	(5.3		)	(2.2		)
Amortization of prior service cost (credit)	4.7			4.7			(0.1		)	(0.2		)
Amortization of net actuarial loss	41.7			28.0			1.3			1.5
Curtailment loss	10.7			—			—			—
Net periodic benefit cost	$	39.4		$	20.7		$	11.0		$	16.5