Pension and Postretirement Plans (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2012			2011			2012			2011
(dollars in millions)	Pension Benefits						Postretirement and Other Benefits
Service cost	$	0.6		$	1.3		$	0.1		$	0.1
Interest cost on projected benefit obligation	6.1			6.2			1.6			1.8
Expected return on plan assets	(6.9		)	(7.3		)	—			—
Amortization of:
Prior service cost (benefit)	—			0.1			(3.3		)	(3.3		)
Actuarial loss	3.9			3.6			1.6			1.6
Benefit costs	$	3.7		$	3.9		$	—		$	0.2