Pension and Postretirement Plans (Tables)

6 Months Ended

Jun. 30, 2012

General Discussion of Pension and Other Postretirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

Pension and postretirement benefit costs are as follows:

	Three Months Ended June 30,
	2012			2011			2012			2011
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	0.7		$	1.3		$	0.1		$	0.1
Interest cost on projected benefit obligation	4.6			6.2			1.2			1.8
Expected return on plan assets	(6.1		)	(7.3		)	—			—
Amortization of:
Prior service cost (benefit)	0.1			0.1			(3.3		)	(3.3		)
Actuarial loss	5.8			3.5			1.8			1.6
Curtailment loss	—			4.2			—			—
Benefit costs	$	5.1		$	8.0		$	(0.2	)	$	0.2

	Six Months Ended June 30,
	2012			2011			2012			2011
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	1.3		$	2.6		$	0.2		$	0.2
Interest cost on projected benefit obligation	10.7			12.4			2.8			3.6
Expected return on plan assets	(13.0		)	(14.6		)	—			—
Amortization of:
Prior service cost (benefit)	0.1			0.2			(6.6		)	(6.6		)
Actuarial loss	9.7			7.1			3.4			3.2
Curtailment loss	—			4.2			—			—
Benefit costs	$	8.8		$	11.9		$	(0.2	)	$	0.4