Pension and Postretirement Benefit Costs

9 Months Ended

Sep. 30, 2011

Compensation and Retirement Disclosure [Abstract]

Pension and Postretirement Benefit Costs

Pension and Postretirement Benefit Costs

Net periodic pension costs included the following components:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011			2010
				(Dollars in millions)
Service cost for benefits earned	$	0.4		$	0.4		$	1.3		$	1.2
Interest cost on projected benefit obligation	12.4			12.6			37.3			37.8
Expected return on plan assets	(16.1		)	(14.6		)	(48.3		)	(43.8		)
Amortization of prior service cost	0.3			0.4			0.8			1.1
Amortization of actuarial loss	7.5			5.4			22.5			16.4
Net periodic pension costs	$	4.5		$	4.2		$	13.6		$	12.7

As of September 30, 2011, the Company’s qualified defined benefit pension plans were at or above the thresholds of the Pension Protection Act of 2006 to avoid benefit restrictions and at-risk penalties for 2011. No contributions to the qualified plans are expected during 2011. However, the Company does expect to make contributions to its non-qualified defined benefit pension plans during 2011 totaling less than $2 million.

Net periodic postretirement benefit costs included the following components:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
			(Dollars in millions)
Service cost for benefits earned	$	3.6	$	3.5	$	10.1	$	9.7
Interest cost on accumulated postretirement benefit obligation	14.5		14.7		43.4		43.8
Amortization of prior service cost	0.8		0.5		1.8		1.5
Amortization of actuarial loss	6.7		6.8		20.2		19.5
Net periodic postretirement benefit costs	$	25.6	$	25.5	$	75.5	$	74.5