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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 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 March 31, 2020 |  |  |  |  |  |  |  |  |  |
Supplemental executive retirement plan assets | $ | 21.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 21.2 |
Total financial assets | 21.2 |  |  | — |  |  | — |  |  | 21.2 |
Derivatives, net | — |  |  | (12.6 | ) |  | — |  |  | (12.6 | )
Total financial liabilities | $ | — |  |  | $ | (12.6 | ) |  | $ | — |  |  | $ | (12.6 | )
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):
| March 31, 2020 |  | December 31, 2019
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
6.875% Senior notes due 2020 | $ | 124.1 |  |  | $ | 27.8 |  |  | $ | 124.8 |  |  | $ | 117.3 |
4.70% Senior notes due 2021 | 100.4 |  |  | 10.4 |  |  | 113.2 |  |  | 95.5 |
4.875% Senior notes due 2022 | 601.2 |  |  | 125.9 |  |  | 599.2 |  |  | 460.5 |
3.00% Exchangeable senior notes due 2024(1) | 707.7 |  |  | 214.3 |  |  | 699.0 |  |  | 607.4 |
4.50% Senior notes due 2024 | 302.0 |  |  | 28.6 |  |  | 302.0 |  |  | 167.2 |
4.75% Senior notes due 2024 | 278.6 |  |  | 64.2 |  |  | 276.5 |  |  | 201.4 |
8.00% Senior notes due 2024 | 295.5 |  |  | 27.6 |  |  | 295.7 |  |  | 181.7 |
5.20% Senior notes due 2025 | 331.8 |  |  | 33.8 |  |  | 331.7 |  |  | 186.7 |
7.375% Senior notes due 2025 | 330.2 |  |  | 82.6 |  |  | 329.2 |  |  | 218.6 |
7.75% Senior notes due 2026 | 987.7 |  |  | 107.7 |  |  | 987.1 |  |  | 575.1 |
7.20% Debentures due 2027 | 111.7 |  |  | 16.6 |  |  | 111.7 |  |  | 70.0 |
7.875% Senior notes due 2040 | 372.8 |  |  | 46.9 |  |  | 373.3 |  |  | 153.5 |
5.40% Senior notes due 2042 | 263.2 |  |  | 78.8 |  |  | 262.8 |  |  | 194.4 |
5.75% Senior notes due 2044 | 974.2 |  |  | 93.5 |  |  | 973.3 |  |  | 450.0 |
5.85% Senior notes due 2044 | 269.1 |  |  | 80.6 |  |  | 268.8 |  |  | 194.8 |
Amounts borrowed under credit facility(2) | 322.9 |  |  | 328.9 |  |  | — |  |  | — |
Total debt | $ | 6,373.1 |  |  | $ | 1,368.2 |  |  | $ | 6,048.3 |  |  | $ | 3,874.1 |
Less: current maturities | 224.5 |  |  | — |  |  | 124.8 |  |  | — |
Total long-term debt | $ | 6,148.6 |  |  | $ | 1,368.2 |  |  | $ | 5,923.5 |  |  | $ | 3,874.1 |
(1) | Our 2024 Convertible Notes were issued with a conversion feature. The 2024 Convertible Notes were separated into their liability and equity components on our condensed consolidated balance sheet. The equity component was initially recorded to additional paid-in capital and as a debt discount that will be amortized to interest expense over the life of the instrument. Excluding the unamortized discount, the carrying value of the 2024 Convertible Notes was $839.2 million and $838.3 million as of March 31, 2020 and December 31, 2019, respectively.
(2) | Total outstanding borrowings under our credit facility are $328.9 million and are recorded net of $6.0 million of unamortized deferred financing cost on our condensed consolidated balance sheet. In addition, we have $3.2 million in letters of credit issued under our credit facility, leaving $1.3 billion of undrawn borrowing capacity.

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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=118260190&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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