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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule Of Long-Term Debt Instruments
The carrying value of our debt as of December 31, 2020 and 2019 consisted of the following (in millions):
2020(1)
2019
6.875% Senior notes due 2020
$122.9 $124.8 
4.70% Senior notes due 2021
100.7 113.2 
4.875% Senior notes due 2022(2)
620.8 599.2 
3.00% Exchangeable senior notes due 2024
849.5 699.0 
4.50% Senior notes due 2024
303.4 302.0 
4.75% Senior notes due 2024(2)
318.6 276.5 
8.00% Senior notes due 2024
292.3 295.7 
5.20% Senior notes due 2025
333.7 331.7 
7.375% Senior notes due 2025(2)
360.8 329.2 
7.75% Senior notes due 2026
1,000.0 987.1 
7.20% Debentures due 2027
112.1 111.7 
7.875% Senior notes due 2040
300.0 373.3 
5.40% Senior notes due 2042(2)
400.0 262.8 
5.75% Senior notes due 2044
1,000.5 973.3 
5.85% Senior notes due 2044(2)
400.0 268.8 
Amounts drawn under the revolving credit facility (3)
581.0 — 
Total debt$7,096.3 $6,048.3 
Less: Liabilities Subject to Compromise7,096.3 — 
Less: current maturities— 124.8 
Total long-term debt$— $5,923.5 

(1)    The carrying amounts above represent the aggregate principal amount of Senior Notes outstanding as well as outstanding borrowings under our revolving credit facility as of the Petition Date and are classified as Liabilities Subject to Compromise in our Consolidated Balance Sheet as of December 31, 2020. We discontinued accruing interest on our indebtedness following the Petition Date and all accrued interest as of the Petition Date is classified as Liabilities Subject to Compromise in our Consolidated Balance Sheet as of December 31, 2020. Additionally, we incurred a net non-cash charge of $447.9 million to write off any unamortized debt discounts, premiums and issuance costs, including the amounts related to the 2024 Convertible Notes discussed below, which is included in Reorganization Items, net on our Consolidated Statement of Operations for the year ended December 31, 2020. See below and "Note 2 - Chapter 11 Proceedings and Ability to Continue as a Going Concern" for additional information.

(2)    These senior notes were acquired in the Rowan Transaction.

(3)    In addition to the amount borrowed above, we had $27.0 million in undrawn letters of credit issued under the revolving credit facility.
Convertible Debt
As of December 31, 2020 and 2019, the 2024 Convertible Notes consist of the following (in millions):
Liability component:20202019
Principal$849.5 $849.5 
Less: Unamortized debt discount and issuance costs— (150.5)
Net carrying amount (1)
$849.5 $699.0 
Equity component, net$220.0 $220.0 

(1)    The carrying amount at December 31, 2020 represents the aggregate principal amount of these notes as of the Petition Date and are classified as Liabilities Subject to Compromise in our Consolidated Balance Sheet as of December 31, 2020.
Schedule of Extinguishment of Debt
Our tender offers and open market repurchases during the three-year period ended December 31, 2020 are summarized in the following table (in millions):
Aggregate Principal Amount Repurchased
Aggregate Repurchase Price(1)
Year Ended December 31, 2020
4.70% Senior notes due 2021
$12.8 $9.7 
Year Ended December 31, 2019
4.50% Senior notes due 2024
$320.0 $240.0 
4.75% Senior notes due 2024
79.5 61.2 
8.00% Senior notes due 2024
39.7 33.8 
5.20% Senior notes due 2025
335.5 250.0 
7.375% Senior notes due 2025
139.2 109.2 
7.20% Senior notes due 2027
37.9 29.9 
$951.8 $724.1 
Year Ended December 31, 2018
8.50% Senior notes due 2019
$237.6 $256.8 
6.875% Senior notes due 2020
328.0 354.7 
4.70% Senior notes due 2021
156.2 159.7 
$721.8 $771.2 

(1)    Excludes accrued interest paid to holders of the repurchased senior notes.
Aggregate Maturities Of Long-Term Debt
The original principal amounts issued under our senior notes have subsequently changed as a result of our tenders, repurchases, exchanges, redemptions and new debt issuances such that the balance outstanding at December 31, 2020 were as follows (in millions):
Subject to Compromise(2)
Senior Notes(2)
Original Principal2016 Tenders, Repurchases and Equity Exchange2017 Exchange Offers and Repurchases2018 Tender Offers, Redemption and Debt Issuance2019 Tender Offers and Acquired Debt2020 Open Market RepurchaseRemaining Principal
6.875% Senior Notes due 2020
$900.0 $(219.2)$(229.9)$(328.0)$— $— $122.9 
4.70% Senior Notes due 2021
1,500.0 (817.0)(413.3)(156.2)— (12.8)100.7 
4.875% Senior notes due 2022(1)
— — — — 620.8 — 620.8 
3.00% Exchangeable senior notes due 2024
849.5 — — — — — 849.5 
4.50% Senior notes due 2024
625.0 (1.6)— — (320.0)— 303.4 
4.75% Senior notes due 2024(1)
— — — — 318.6 — 318.6 
8.00% Senior Notes due 2024
— — 332.0 — (39.7)— 292.3 
5.20% Senior Notes due 2025
700.0 (30.8)— — (335.5)— 333.7 
7.375% Senior Notes due 2025(1)
— — — — 360.8 — 360.8 
7.75% Senior Notes due 2026
— — — 1,000.0 — — 1,000.0 
7.20% Debentures due 2027
150.0 — — — (37.9)— 112.1 
7.875% Senior notes due 2040
300.0 — — — — — 300.0 
5.40% Senior notes due 2042 (1)
— — — — 400.0 — 400.0 
5.75% Senior notes due 2044
1,025.0 (24.5)— — — — 1,000.5 
5.85% Senior notes due 2044 (1)
— — — — 400.0 — 400.0 
Total$6,049.5 $(1,093.1)$(311.2)$515.8 $1,367.1 $(12.8)$6,515.3 

(1)These senior notes were acquired in the Rowan Transaction.

(2)The $6.5 billion aggregate principal amount of Senior Notes outstanding as well as associated $201.9 million in accrued interest as of the Petition Date are classified as Liabilities Subject to Compromise in our Consolidated Balance Sheet as of December 31, 2020. The maturity dates represent the maturity dates per the debt agreements; however, we are in default on these senior notes and are currently in chapter 11 proceedings. See "Senior Notes" above and "Note 2– Chapter 11 Proceedings and Ability to Continue as a Going Concern” for additional information for additional details regarding Chapter 11 Cases.