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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount (premium).

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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DEBT (Details 1) - USD ($) $ in Millions	Dec. 31, 2020	May 19, 2020	Dec. 31, 2019	Jul. 16, 2019	Jan. 19, 2018
Debt Instrument [Line Items]
Notes payable	$ 3,905.2		$ 3,381.2
Receivables Financing Agreement (See Note 6)	125.0		0.0
Finance lease obligations	4.3		5.3
Deferred debt issuance costs	(37.4)		(38.2)
Unamortized bond original issue discount	2.2		0.0
Interest rate swaps	(1.8)		(2.2)
Total debt	3,863.8		3,340.8
Amounts due within one year	26.3		2.1
Total long-term debt	3,837.5		3,338.7
$500.0 million Senior Secured Delayed Draw Term Loan
Debt Instrument [Line Items]
Notes payable	$ 500.0		$ 0.0
Interest rate	4.125%		0.00%
Variable-Rate Recovery Zone Bonds
Debt Instrument [Line Items]
Notes payable	$ 103.0		$ 103.0
Interest rate	3.625%		2.85%
Variable-Rate Go Zone Bonds
Debt Instrument [Line Items]
Notes payable	$ 50.0		$ 50.0
Interest rate	3.625%		2.85%
Industrial Development and Environmental Improvement Obligations
Debt Instrument [Line Items]
Notes payable	$ 2.9		$ 2.9
Interest rate	0.21%		1.70%
2025 Notes 10.00%
Debt Instrument [Line Items]
Notes payable	$ 500.0		$ 500.0
Interest rate	10.00%		10.00%
2023 Notes
Debt Instrument [Line Items]
Notes payable	$ 120.0		$ 720.0
Interest rate	9.75%		9.75%
2025 Notes 9.50%
Debt Instrument [Line Items]
Notes payable	$ 500.0		$ 0.0
Interest rate	9.50%	9.50%	0.00%
2029 Notes
Debt Instrument [Line Items]
Notes payable	$ 750.0		$ 750.0
Interest rate	5.625%		5.625%	5.625%
2022 Notes
Debt Instrument [Line Items]
Notes payable	$ 200.0		$ 200.0
Interest rate	5.50%		5.50%
2027 Notes
Debt Instrument [Line Items]
Notes payable	$ 500.0		$ 500.0
Interest rate	5.125%		5.125%
2030 Notes
Debt Instrument [Line Items]
Notes payable	$ 550.0		$ 550.0
Interest rate	5.00%		5.00%		5.00%