FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2018

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 March 31, 2018	Level 1		Level 2		Level 3		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	12.2	$	—	$	12.2
Commodity contracts	—		6.3		—		6.3
Foreign exchange contracts	—		0.5		—		0.5
Liabilities
Interest rate swaps	$	—	$	40.3	$	—	$	40.3
Commodity contracts	—		0.8		—		0.8
Balance at December 31, 2017
Assets
Interest rate swaps	$	—	$	10.5	$	—	$	10.5
Commodity contracts	—		11.3		—		11.3
Foreign exchange contracts	—		1.0		—		1.0
Liabilities
Interest rate swaps	$	—	$	28.1	$	—	$	28.1
Commodity contracts	—		3.8		—		3.8
Balance at March 31, 2017
Assets
Interest rate swaps	$	—	$	11.4	$	—	$	11.4
Commodity contracts	—		6.3		—		6.3
Foreign exchange contracts	—		0.2		—		0.2
Liabilities
Interest rate swaps	$	—	$	29.7	$	—	$	29.7
Commodity contracts	—		0.2		—		0.2
Foreign exchange contracts	—		0.3		—		0.3

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								Amount recorded on balance sheets
	Level 1		Level 2		Level 3		Total
	($ in millions)
Balance at March 31, 2018	$	—	$	3,583.9	$	153.0	$	3,736.9	$	3,535.4
Balance at December 31, 2017	—		3,758.0		153.0		3,911.0		3,612.0
Balance at March 31, 2017	—		3,759.2		153.0		3,912.2		3,612.6