PENSION PLANS AND RETIREMENT BENEFITS (Tables)

6 Months Ended

Jun. 30, 2012

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit (Income) Cost

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended June 30,						Three Months Ended June 30,
	2012			2011			2012			2011
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	1.6		$	1.6		$	0.3		$	0.3
Interest cost	22.6			23.5			0.8			1.0
Expected return on plans’ assets	(35.6		)	(34.9		)	—			—
Amortization of prior service cost	0.1			0.1			(0.1		)	—
Recognized actuarial loss	5.9			3.6			1.0			0.7
Curtailment	—			1.1			—			—
Net periodic benefit (income) cost	$	(5.4	)	$	(5.0	)	$	2.0		$	2.0

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	3.1		$	3.2		$	0.7		$	0.7
Interest cost	46.1			47.2			1.7			1.9
Expected return on plans’ assets	(69.8		)	(69.8		)	—			—
Amortization of prior service cost	0.1			0.2			(0.1		)	(0.1		)
Recognized actuarial loss	10.2			7.5			1.9			1.4
Curtailment	—			1.1			—			—
Net periodic benefit (income) cost	$	(10.3	)	$	(10.6	)	$	4.2		$	3.9