Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2011

Compensation and Retirement Disclosure [Abstract]

Net Periodic Benefit Cost

The following tables provide the components of net periodic benefit cost:

	Pension Benefits			Pension Benefits
	For the three months ended				For the nine months ended
	September 30,			September 30,
	2011		2010		2011	2010
($ in thousands)
Components of net periodic pension benefit cost
Service cost	$          9,615	$	8,994	$	28,844	$         12,212
Interest cost on projected benefit obligation	21,172		21,601		63,516	46,364
Expected return on plan assets	(25,589)		(23,262)		(76,766)	(46,561)
Amortization of prior service cost /(credit)	(50)		(49)		(150)	(149)
Amortization of unrecognized loss	4,435		7,048		13,306	20,545
Net periodic pension benefit cost	$          9,583	$	14,332	$	28,750	$         32,411
	Postretirement Benefits			Postretirement Benefits
	Other Than Pensions (OPEB)			Other Than Pensions (OPEB)
	For the three months ended				For the nine months ended
	September 30,				September 30,
	2011		2010		2011	2010
($ in thousands)
Components of net periodic postretirement benefit cost
Service cost	$          4,206	$	3,842	$	12,662	$           4,041
Interest cost on projected benefit obligation	5,986		6,241		18,642	11,499
Expected return on plan assets	(79)		(113)		(242)	(330)
Amortization of prior service cost/(credit)	(2,552)		(1,932)		(7,651)	(5,790)
Amortization of unrecognized loss	607		528		3,604	3,690
Net periodic postretirement benefit cost	$          8,168	$	8,566	$	27,015	$         13,110