DEBT (Tables)

12 Months Ended

Dec. 31, 2018

Debt Instruments [Abstract]

Schedule of long-term debt

	December 31,
	2018			2017
Notes payable:	($ in millions)
Variable-rate Senior Term Loan Facility, due 2022 (4.02% and 3.57% at December 31, 2018 and 2017, respectively)	$	543.0		$	1,323.4
Variable-rate Recovery Zone bonds, due 2024-2035 (3.67% and 3.27% at December 31, 2018 and 2017, respectively)	103.0			103.0
Variable-rate Go Zone bonds, due 2024 (3.67% and 3.27% at December 31, 2018 and 2017, respectively)	50.0			50.0
Variable-rate Industrial development and environmental improvement obligations, due 2025 (2.52% and 1.27% at December 31, 2018 and 2017, respectively)	2.9			2.9
9.75%, due 2023	720.0			720.0
10.00%, due 2025	500.0			500.0
5.50%, due 2022	200.0			200.0
5.125%, due 2027	500.0			500.0
5.00%, due 2030	550.0			—
Senior Revolving Credit Facility	—			20.0
Receivables Financing Agreement	125.0			249.7
Capital lease obligations	4.2			3.7
Total notes payable	3,298.1			3,672.7
Deferred debt issuance costs	(34.1		)	(32.6		)
Interest rate swaps	(33.7		)	(28.1		)
Total debt	3,230.3			3,612.0
Amounts due within one year	125.9			0.7
Total long-term debt	$	3,104.4		$	3,611.3