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Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule Of Long-Term Debt Instruments | The carrying value of our long-term debt as of December 31, 2018 and 2017 consisted of the following (in millions):
|  | 2018 |  | 2017
8.50% Senior notes due 2019(1) |  | $ | — |  |  | $ | 251.4 |
6.875% Senior notes due 2020(1) |  | 127.5 |  |  | 477.9 |
4.70% Senior notes due 2021(1) |  | 112.7 |  |  | 267.1 |
3.00% Exchangeable senior notes due 2024(2) |  | 666.8 |  |  | 635.7 |
4.50% Senior notes due 2024 |  | 619.8 |  |  | 619.3 |
8.00% Senior notes due 2024 |  | 337.0 |  |  | 337.9 |
5.20% Senior notes due 2025 |  | 664.4 |  |  | 663.6 |
7.75% Senior notes due 2026 |  | 985.0 |  |  | — |
7.20% Debentures due 2027 |  | 149.3 |  |  | 149.3 |
7.875% Senior notes due 2040 |  | 375.0 |  |  | 376.7 |
5.75% Senior notes due 2044 |  | 972.9 |  |  | 971.8 |
Total long-term debt |  | $ | 5,010.4 |  |  | $ | 4,750.7 |
(1) | The decline in the carrying value of our 8.50% senior notes due 2019, 6.875% senior notes due 2020 and our 4.70% senior notes due 2021 resulted from repurchases and redemptions during the first quarter of 2018 discussed below.
(2) | Our 2024 Convertible Notes were issued with a conversion feature. The 2024 Convertible Notes were separated 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 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 $836.3 million and $834.0 million as of December 31, 2018 and 2017, respectively.
Convertible Debt | As of December 31, 2018 and 2017, the 2024 Convertible Notes consist of the following (in millions):
Liability component: |  | 2018 |  | 2017
Principal |  | $ | 849.5 |  |  | $ | 849.5 |
Less: Unamortized debt discount and issuance costs |  | (182.7 | ) |  | (213.8 | )
Net carrying amount |  | 666.8 |  |  | 635.7 |
Equity component, net |  | $ | 220.0 |  |  | $ | 220.0 |
Schedule of Extinguishment of Debt | Our tender offers and open market repurchases during the two-year period ended December 31, 2018 were as follows (in millions): Year Ended December 31, 2018
| Aggregate Principal Amount Repurchased |  | Aggregate Repurchase Price(1)
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 |
Total | $ | 721.8 |  |  | $ | 771.2 |
Year Ended December 31, 2017
| Aggregate Principal Amount Repurchased |  | Aggregate Repurchase Price(1)
8.50% Senior notes due 2019 | $ | 54.6 |  |  | $ | 60.1 |
6.875% Senior notes due 2020 | 100.1 |  |  | 105.1 |
4.70% Senior notes due 2021 | 39.4 |  |  | 39.3 |
Total | $ | 194.1 |  |  | $ | 204.5 |
(1) | Excludes accrued interest paid to holders of the repurchased senior notes.
During 2017, we completed exchange offers to exchange our outstanding 2019 Notes, 2020 Notes and 2021 Notes for our 8% 2024 Notes and cash. The exchange offers resulted in the tender of $649.5 million aggregate principal amount of our outstanding notes that were settled and exchanged as follows (in millions):
| Aggregate Principal Amount Repurchased |  | 8% Senior Notes Due 2024 Consideration |  | Cash Consideration |  | Total Consideration
8.50% Senior notes due 2019 | $ | 145.8 |  |  | $ | 81.6 |  |  | $ | 81.7 |  |  | $ | 163.3 |
6.875% Senior notes due 2020 | 129.8 |  |  | 69.3 |  |  | 69.4 |  |  | 138.7 |
4.70% Senior notes due 2021 | 373.9 |  |  | 181.1 |  |  | 181.4 |  |  | 362.5 |
Total | $ | 649.5 |  |  | $ | 332.0 |  |  | $ | 332.5 |  |  | $ | 664.5 |
Aggregate Maturities Of Long-Term Debt | The descriptions of our senior notes above reflect the original principal amounts issued, which have subsequently changed as a result of our tenders, repurchases, exchanges, redemptions and new debt issuances such that the maturities of our debt were as follows (in millions):
Senior Notes | Original Principal |  | 2016 Tenders, Repurchases and Equity Exchange |  | 2017 Exchange Offers and Repurchases |  | 2018 Tender Offers, Redemption and Debt Issuance |  | Remaining Principal
8.50% due 2019 | $ | 500.0 |  |  | $ | (62.0 | ) |  | $ | (200.4 | ) |  | $ | (237.6 | ) |  | $ | — |
6.875% due 2020 | 900.0 |  |  | (219.2 | ) |  | (229.9 | ) |  | (328.0 | ) |  | 122.9 |
4.70% due 2021 | 1,500.0 |  |  | (817.0 | ) |  | (413.3 | ) |  | (156.2 | ) |  | 113.5 |
3.00% Exchangeable senior notes due 2024 | 849.5 |  |  | — |  |  | — |  |  | — |  |  | 849.5 |
4.50% due 2024 | 625.0 |  |  | (1.7 | ) |  | — |  |  | — |  |  | 623.3 |
8.00% due 2024 | — |  |  | — |  |  | 332.0 |  |  | — |  |  | 332.0 |
5.20% due 2025 | 700.0 |  |  | (30.7 | ) |  | — |  |  | — |  |  | 669.3 |
7.75% due 2026 | — |  |  | — |  |  | — |  |  | 1,000.0 |  |  | 1,000.0 |
7.20% due 2027 | 150.0 |  |  | — |  |  | — |  |  | — |  |  | 150.0 |
7.875% due 2040 | 300.0 |  |  | — |  |  | — |  |  | — |  |  | 300.0 |
5.75% due 2044 | 1,025.0 |  |  | (24.5 | ) |  | — |  |  | — |  |  | 1,000.5 |
Total | $ | 6,549.5 |  |  | $ | (1,155.1 | ) |  | $ | (511.6 | ) |  | $ | 278.2 |  |  | $ | 5,161.0 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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