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Long-Term Debt and Finance Lease Obligations - 2025 Notes and 2028 Notes, Redemption Price (Details) - Senior Notes	12 Months Ended
	Dec. 31, 2020
2025 Notes | 12-Month Period Beginning February 15, 2022/2023
Debt Instrument, Redemption [Line Items]
Redemption prices as percentage of principal amount	102.625%
2025 Notes | 12-Month Period Beginning February 15, 2023/2024
Debt Instrument, Redemption [Line Items]
Redemption prices as percentage of principal amount	101.313%
2025 Notes | 12-Month Period Beginning February 15, 2024 and thereafter/2025
Debt Instrument, Redemption [Line Items]
Redemption prices as percentage of principal amount	100.00%
2028 Notes | 12-Month Period Beginning February 15, 2022/2023
Debt Instrument, Redemption [Line Items]
Redemption prices as percentage of principal amount	102.875%
2028 Notes | 12-Month Period Beginning February 15, 2023/2024
Debt Instrument, Redemption [Line Items]
Redemption prices as percentage of principal amount	101.917%
2028 Notes | 12-Month Period Beginning February 15, 2024 and thereafter/2025
Debt Instrument, Redemption [Line Items]
Redemption prices as percentage of principal amount	100.958%
2028 Notes | 12-Month Period Beginning February 15, 2026 and thereafter
Debt Instrument, Redemption [Line Items]
Redemption prices as percentage of principal amount	100.00%

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- Definition

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.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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