FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Table of financial instruments measured at fair value

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

	Fair Value Measurements
Balance at June 30, 2013	Level 1		Level 2		Level 3		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	7.0	$	—	$	7.0
Liabilities
Interest rate swaps	$	—	$	8.8	$	—	$	8.8
Commodity forward contracts	0.3		7.6		—		7.9
Earn out	—		—		23.3		23.3
Balance at December 31, 2012
Assets
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 June 30, 2012
Assets
Interest rate swaps	$	—	$	9.4	$	—	$	9.4
Liabilities
Interest rate swaps	$	—	$	11.6	$	—	$	11.6
Commodity forward contracts	1.3		6.4		—		7.7
Earn out	—		—		35.3		35.3

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

The following table summarizes the activity for our earn out liability measured at fair value using Level 3 inputs:

	June 30,
	2013			2012
	($ in millions)
Balance at beginning of year	$	42.0		$	49.0
Settlements	(23.2		)	(18.5		)
Unrealized losses included in other expense	4.5			4.8
Balance at end of period	$	23.3		$	35.3

Fair value of debt table

The following table summarizes the fair value measurements of debt and the actual debt recorded on our condensed balance sheets:

	Fair Value Measurements
	Level 1		Level 2		Level 3		Total		Amount recorded on balance sheets
	($ in millions)
Balance at June 30, 2013	$	—	$	587.8	$	153.0	$	740.8	$	701.3
Balance at December 31, 2012	—		605.1		153.0		758.1		713.7
Balance at June 30, 2012	—		400.2		153.0		553.2		527.5