DEBT (Tables)

12 Months Ended

Dec. 31, 2019

Debt Instruments [Abstract]

Schedule of long-term debt

	December 31,
	2019			2018
Notes payable:	($ in millions)
Variable-rate Delayed Draw Term Loan Facility, due 2024 (4.02% at December 31, 2018)	$	—		$	543.0
Variable-rate Recovery Zone bonds, due 2024-2035 (2.85% and 3.67% at December 31, 2019 and 2018, respectively)	103.0			103.0
Variable-rate Go Zone bonds, due 2024 (2.85% and 3.67% at December 31, 2019 and 2018, respectively)	50.0			50.0
Variable-rate Industrial development and environmental improvement obligations, due 2025 (1.70% and 2.52% at December 31, 2019 and 2018, respectively)	2.9			2.9
10.00%, due 2025	500.0			500.0
9.75%, due 2023	720.0			720.0
5.625%, due 2029	750.0			—
5.50%, due 2022	200.0			200.0
5.125%, due 2027	500.0			500.0
5.00%, due 2030	550.0			550.0
Receivables Financing Agreement (See Note 7)	—			125.0
Finance lease obligations	5.3			4.2
Total notes payable	3,381.2			3,298.1
Deferred debt issuance costs	(38.2		)	(34.1		)
Interest rate swaps	(2.2		)	(33.7		)
Total debt	3,340.8			3,230.3
Amounts due within one year	2.1			125.9
Total long-term debt	$	3,338.7		$	3,104.4