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DEBT (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Instruments [Abstract]  
Schedule of long-term debt
December 31,
20202019
Notes payable:($ in millions)
Variable-rate Delayed Draw Term Loan secured facility, due 2024 (4.125% at December 31, 2020)$500.0 $— 
Variable-rate Recovery Zone secured bonds, due 2024-2035 (3.625% and 2.85% at December 31, 2020 and 2019, respectively)103.0 103.0 
Variable-rate Go Zone secured bonds, due 2024 (3.625% and 2.85% at December 31, 2020 and 2019, respectively)50.0 50.0 
Variable-rate Industrial development and environmental improvement unsecured obligations, due 2025 (0.21% and 1.70% at December 31, 2020 and 2019, respectively)2.9 2.9 
10.00% secured senior notes, due 2025500.0 500.0 
9.75% secured senior notes, due 2023120.0 720.0 
9.50% secured senior notes, due 2025500.0 — 
5.625% secured senior notes, due 2029750.0 750.0 
5.50% unsecured senior notes, due 2022200.0 200.0 
5.125% secured senior notes, due 2027500.0 500.0 
5.00% secured senior notes, due 2030550.0 550.0 
Receivables Financing Agreement (See Note 6)125.0 — 
Finance lease obligations
4.3 5.3 
Total notes payable
3,905.2 3,381.2 
Deferred debt issuance costs(37.4)(38.2)
Unamortized bond original issue discount(2.2)— 
Interest rate swaps(1.8)(2.2)
Total debt3,863.8 3,340.8 
Amounts due within one year26.3 2.1 
Total long-term debt$3,837.5 $3,338.7