FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2012

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, 2012	Level 1		Level 2		Level 3		Total
Assets	($ in millions)
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
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
Balance at June 30, 2011
Assets
Interest rate swaps	$	—	$	8.4	$	—	$	8.4
Commodity forward contracts	3.3		5.3		—		8.6
Liabilities
Interest rate swaps	$	—	$	8.5	$	—	$	8.5
Commodity forward contracts	—		0.1		—		0.1
Earn out	—		—		43.2		43.2

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,
	2012			2011
	($ in millions)
Balance at beginning of year	$	49.0		$	—
(Settlements) purchases	(18.5		)	42.3
Unrealized losses included in other (expense) income	4.8			0.9
Balance at end of period	$	35.3		$	43.2

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, 2012	$	—	$	400.2	$	153.0	$	553.2	$	527.5
Balance at December 31, 2011	—		391.4		160.9		552.3		536.4
Balance at June 30, 2011	—		488.3		124.8		613.1		582.8