Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2011

Pension and Postretirement Benefits [Abstract]

Net Periodic Benefit Cost / (Income)

Net Periodic Benefit Cost / (Income)		Pension						Postretirement
$ in millions		2011			2010			2011			2010
Service cost	$	0.8		$	1.0		$	-		$	0.1
Interest cost		4.1			4.5			0.2			0.3
Expected return on assets (a)		(6.2	)		(5.6	)		(0.1	)		-
Amortization of unrecognized:
Actuarial (gain) / loss		1.7			2.0			(0.5	)		(0.2	)
Prior service cost		0.5			0.9			0.1			-
Net periodic benefit cost / (income) before adjustments	$	0.9		$	2.8		$	(0.3	)	$	0.2

(a) For purposes of calculating the expected return on pension plan assets, under GAAP, the market-related value of assets (MRVA) is used. GAAP requires that the difference between actual plan asset returns and estimated plan asset returns be included in the MRVA equally over a period not to exceed five years. We use a methodology under which we include the difference between actual and estimated asset returns in the MRVA equally over a three year period. The MRVA used in the calculation of expected return on pension plan assets for the 2011 net periodic benefit cost was approximately $317 million.

Net Periodic Benefit Cost / (Income)		Pension						Postretirement
$ in millions		2011			2010			2011			2010
Service cost	$	3.7		$	3.2		$	0.1		$	0.1
Interest cost		12.7			13.5			0.7			1.0
Expected return on assets (a)		(18.4	)		(16.8	)		(0.2	)		(0.2	)
Amortization of unrecognized:
Actuarial (gain) / loss		6.2			5.6			(0.9	)		(0.6	)
Prior service cost		1.6			2.8			0.1			0.1
Net periodic benefit cost / (income) before adjustments	$	5.8		$	8.3		$	(0.2	)	$	0.4

(a) For purposes of calculating the expected return on pension plan assets, under GAAP, the market-related value of assets (MRVA) is used. GAAP requires that the difference between actual plan asset returns and estimated plan asset returns be included in the MRVA equally over a period not to exceed five years. We use a methodology under which we include the difference between actual and estimated asset returns in the MRVA equally over a three year period. The MRVA used in the calculation of expected return on pension plan assets for the 2011 net periodic benefit cost was approximately $317 million.

Schedule of Estimated Future Benefit Payments

Estimated Future Benefit Payments and Medicare Part D Reimbursements
$ in millions		Pension	Postretirement
2011	$	5.3	$	0.6
2012	$	23.1	$	2.4
2013	$	23.1	$	2.4
2014	$	23.6	$	2.3
2015	$	24.0	$	2.1
2016 - 2020	$	122.9	$	8.8