FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2018	Level 1		Level 2		Level 3		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	11.2	$	—	$	11.2
Commodity contracts	—		4.3		—		4.3
Foreign exchange contracts	—		1.2		—		1.2
Liabilities
Interest rate swaps	$	—	$	44.1	$	—	$	44.1
Commodity contracts	—		0.9		—		0.9
Foreign exchange contracts	—		0.5		—		0.5
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 June 30, 2017
Assets
Interest rate swaps	$	—	$	9.6	$	—	$	9.6
Commodity contracts	—		4.0		—		4.0
Foreign exchange contracts	—		1.2		—		1.2
Liabilities
Interest rate swaps	$	—	$	25.0	$	—	$	25.0
Commodity contracts	—		2.2		—		2.2

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								Amount recorded on balance sheets
	Level 1		Level 2		Level 3		Total
	($ in millions)
Balance at June 30, 2018	$	—	$	3,521.6	$	153.0	$	3,674.6	$	3,513.5
Balance at December 31, 2017	—		3,758.0		153.0		3,911.0		3,612.0
Balance at June 30, 2017	—		3,777.8		153.0		3,930.8		3,600.6