PENSION PLANS AND RETIREMENT BENEFITS (Tables)

3 Months Ended

Mar. 31, 2012

PENSION PLANS AND RETIREMENT BENEFITS [Abstract]

Components of Net Periodic Benefit (Income) Cost

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
	2012			2011			2012		2011
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	1.5		$	1.6		$	0.4	$	0.4
Interest cost		23.5			23.7			0.9		0.9
Expected return on plans' assets		(34.2	)		(34.9	)		-		-
Amortization of prior service cost		-			0.1			-		(0.1	)
Recognized actuarial loss		4.3			3.9			0.9		0.7
Net periodic benefit (income) cost	$	(4.9	)	$	(5.6	)	$	2.2	$	1.9