FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Activity summary of financial instruments measured at fair value using level 3 inputs

	December 31,
	2012			2011
	($ in millions)
Beginning balance	$	49.0		$	—
(Settlements) purchases	(18.5		)	42.3
Unrealized losses included in other expense (income)	11.5			6.7
Ending balance	$	42.0		$	49.0

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table summarizes the assets and liabilities measured at fair value in the consolidated balance sheets:

Balance at December 31, 2012	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	8.3	$	—	$	8.3
Commodity forward contracts	0.1		7.5		—		7.6
Liabilities
Interest rate swaps	—		10.2		—		10.2
Earn out	—		—		42.0		42.0
Balance at December 31, 2011
Assets
Interest rate swaps	$	—	$	13.8	$	—	$	13.8
Liabilities
Interest rate swaps	—		13.7		—		13.7
Commodity forward contracts	2.5		7.7		—		10.2
Earn out	—		—		49.0		49.0

For the

FairValueOfDebtTable [Table Text Block]

	Fair Value Measurements
	Level 1		Level 2		Level 3		Total		Amount recorded on balance sheets
	$ in millions
Balance at December 31, 2012	$	—	$	605.1	$	153.0	$	758.1	$	713.7
Balance at December 31, 2011	—		391.4		160.9		552.3		536.4