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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis | The following fair value hierarchy table categorizes information regarding our financial assets and liabilities measured at fair value on a recurring basis (in millions):
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
As of December 31, 2020 |  |  |  |  |  |  |
Supplemental executive retirement plan assets | $ | 22.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 22.6 |
Total financial assets | $ | 22.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 22.6 |
As of December 31, 2019 |  |  |  |  |  |  |
Supplemental executive retirement plan assets | $ | 26.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 26.0 |
Derivatives, net | — |  |  | 5.4 |  |  | — |  |  | 5.4 |
Total financial assets | $ | 26.0 |  |  | $ | 5.4 |  |  | $ | — |  |  | $ | 31.4 |
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments | The carrying values and estimated fair values of our debt instruments were as follows (in millions):
|  | Subject to Compromise (1) |  |  |  |
|  | December 31, 2020 |  | December 31, 2019
|  | Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
6.875% Senior notes due 2020 |  | $ | 122.9 |  |  | $ | 8.6 |  |  | $ | 124.8 |  |  | $ | 117.3 |
4.70% Senior notes due 2021 |  | 100.7 |  |  | 4.5 |  |  | 113.2 |  |  | 95.5 |
4.875% Senior notes due 2022 |  | 620.8 |  |  | 32.9 |  |  | 599.2 |  |  | 460.5 |
3.00% Exchangeable senior notes due 2024 (2) |  | 849.5 |  |  | 76.5 |  |  | 699.0 |  |  | 607.4 |
4.50% Senior notes due 2024 |  | 303.4 |  |  | 13.7 |  |  | 302.0 |  |  | 167.2 |
4.75% Senior notes due 2024 |  | 318.6 |  |  | 18.8 |  |  | 276.5 |  |  | 201.4 |
8.00% Senior notes due 2024 |  | 292.3 |  |  | 12.9 |  |  | 295.7 |  |  | 181.7 |
5.20% Senior notes due 2025 |  | 333.7 |  |  | 12.7 |  |  | 331.7 |  |  | 186.7 |
7.375% Senior notes due 2025 |  | 360.8 |  |  | 20.9 |  |  | 329.2 |  |  | 218.6 |
7.75% Senior notes due 2026 |  | 1,000.0 |  |  | 44.0 |  |  | 987.1 |  |  | 575.1 |
7.20% Debentures due 2027 |  | 112.1 |  |  | 5.7 |  |  | 111.7 |  |  | 70.0 |
7.875% Senior notes due 2040 |  | 300.0 |  |  | 21.0 |  |  | 373.3 |  |  | 153.5 |
5.40% Senior notes due 2042 |  | 400.0 |  |  | 23.6 |  |  | 262.8 |  |  | 194.4 |
5.75% Senior notes due 2044 |  | 1,000.5 |  |  | 38.0 |  |  | 973.3 |  |  | 450.0 |
5.85% Senior notes due 2044 |  | 400.0 |  |  | 26.0 |  |  | 268.8 |  |  | 194.8 |
Amounts borrowed under revolving credit facility (3) |  | 581.0 |  |  | 581.0 |  |  | — |  |  | — |
Total debt |  | $ | 7,096.3 |  |  | $ | 940.8 |  |  | $ | 6,048.3 |  |  | $ | 3,874.1 |
Less : Liabilities Subject to Compromise |  | 7,096.3 |  |  | 940.8 |  |  | — |  |  | — |
Less: current maturities |  | — |  |  | — |  |  | 124.8 |  |  | — |
Total long-term debt |  | $ | — |  |  | $ | — |  |  | $ | 5,923.5 |  |  | $ | 3,874.1 |
(1) The commencement of the Chapter 11 Cases on August 19, 2020, constituted an event of default under our Senior Notes and revolving credit facility. Any efforts to enforce payment obligations under the Senior Notes and revolving credit facility, including any rights to require the repurchase by the Company of the 2024 Convertible Notes (as defined below) upon the NYSE delisting of the Class A ordinary shares, are automatically stayed as a result of the filing of the Chapter 11 Cases. 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 "Note 2 - Chapter 11 Proceedings and Ability to Continue as a Going Concern" for additional information. (2) Our 2024 Convertible Notes are exchangeable into cash, our Class A ordinary shares or a combination thereof. The 2024 Convertible Notes were separated, at issuance, into their liability and equity components on our Consolidated Balance Sheet. The equity component was initially recorded to additional paid-in capital and as a debt discount and the discount was being amortized to interest expense over the life of the instrument. As discussed above, 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. We discontinued accruing interest on these notes as of the Petition Date. Additionally, we incurred a net non-cash charge of $128.8 million to write off $119.5 million of unamortized debt discount and $9.3 million of unamortized debt issuance costs related to these notes, which is included in Reorganization Items, net on our Consolidated Statement of Operations for the year ended December 31, 2020. The equity component is $220.0 million at December 31, 2020 and remains in Additional Paid-Capital. (3) In addition to the amount borrowed above, we had $27.0 million in undrawn letters of credit issued under the revolving credit facility.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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