FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

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

Balance at December 31, 2018	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets	($ in millions)
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 December 31, 2017
Assets
Interest rate swaps	$	—	$	10.5	$	—	$	10.5
Commodity contracts	—		11.3		—		11.3
Foreign exchange contracts	—		1.0		—		1.0
Total Assets	$	—	$	22.8	$	—	$	22.8
Liabilities
Interest rate swaps	$	—	$	28.1	$	—	$	28.1
Commodity contracts	—		3.8		—		3.8
Total Liabilities	$	—	$	31.9	$	—	$	31.9

Fair Value Of Debt Table [Table Text Block]

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

	Fair Value Measurements
	Level 1		Level 2		Level 3		Total		Amount recorded on balance sheets
	($ in millions)
Balance at December 31, 2018	$	—	$	3,137.2	$	153.0	$	3,290.2	$	3,230.3
Balance at December 31, 2017	—		3,758.0		153.0		3,911.0		3,612.0