Pension and Postretirement Benefit Costs (Tables)

9 Months Ended

Sep. 30, 2012

Pension Plans, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic pension costs included the following components:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
	(Dollars in millions)
Service cost for benefits earned	$	0.5		$	0.4		$	1.5		$	1.3
Interest cost on projected benefit obligation	11.7			12.4			35.1			37.3
Expected return on plan assets	(15.9		)	(16.1		)	(47.8		)	(48.3		)
Amortization of prior service cost	0.3			0.3			0.8			0.8
Amortization of actuarial loss	12.1			7.5			36.4			22.5
Net periodic pension costs	$	8.7		$	4.5		$	26.0		$	13.6

Other Postretirement Benefit Plans, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic postretirement benefit costs included the following components:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
	(Dollars in millions)
Service cost for benefits earned	$	3.6	$	3.5	$	10.9	$	9.8
Interest cost on accumulated postretirement benefit obligation	13.7		14.5		41.2		43.4
Amortization of prior service cost	0.7		0.8		1.7		1.6
Amortization of actuarial loss	8.1		6.7		24.5		20.2
Net periodic postretirement benefit costs	$	26.1	$	25.5	$	78.3	$	75.0