FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019	Level 1		Level 2		Level 3		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	3.6	$	—	$	3.6
Commodity contracts	—		4.7		—		4.7
Foreign exchange contracts	—		0.3		—		0.3
Total Assets	$	—	$	8.6	$	—	$	8.6
Liabilities
Interest rate swaps	$	—	$	23.5	$	—	$	23.5
Commodity contracts	—		10.1		—		10.1
Foreign exchange contracts	—		0.2		—		0.2
Total Liabilities	$	—	$	33.8	$	—	$	33.8
Balance at December 31, 2018
Assets
Interest rate swaps	$	—	$	5.3	$	—	$	5.3
Commodity contracts	—		0.7		—		0.7
Foreign exchange contracts	—		0.4		—		0.4
Total Assets	$	—	$	6.4	$	—	$	6.4
Liabilities
Interest rate swaps	$	—	$	33.7	$	—	$	33.7
Commodity contracts	—		3.4		—		3.4
Foreign exchange contracts	—		0.5		—		0.5
Total Liabilities	$	—	$	37.6	$	—	$	37.6
Balance at March 31, 2018
Assets
Interest rate swaps	$	—	$	12.2	$	—	$	12.2
Commodity contracts	—		6.3		—		6.3
Foreign exchange contracts	—		0.5		—		0.5
Total Assets	$	—	$	19.0	$	—	$	19.0
Liabilities
Interest rate swaps	$	—	$	40.3	$	—	$	40.3
Commodity contracts	—		0.8		—		0.8
Total Liabilities	$	—	$	41.1	$	—	$	41.1

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, 2019	$	—	$	3,221.9	$	153.0	$	3,374.9	$	3,193.3
Balance at December 31, 2018	—		3,137.2		153.0		3,290.2		3,230.3
Balance at March 31, 2018	—		3,583.9		153.0		3,736.9		3,535.4