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Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Instruments [Abstract] |
Schedule Of Long-Term Debt Instruments | The carrying value of long-term debt as of December 31, 2015 and 2014 consisted of the following (in millions):
|  | 2015 |  | 2014
4.70% Senior notes due 2021 |  | $ | 1,482.7 |  |  | $ | 1,479.9 |
5.75% Senior notes due 2044 |  | 1,004.2 |  |  | 622.3 |
6.875% Senior notes due 2020 |  | 990.9 |  |  | 1,008.2 |
5.20% Senior notes due 2025 |  | 697.6 |  |  | — |
4.50% Senior notes due 2024 |  | 624.3 |  |  | 624.2 |
8.50% Senior notes due 2019 |  | 566.4 |  |  | 583.8 |
7.875% Senior notes due 2040 |  | 379.8 |  |  | 381.2 |
7.20% Debentures due 2027 |  | 149.2 |  |  | 149.2 |
3.25% Senior notes due 2016 |  | — |  |  | 998.0 |
4.33% MARAD bonds due 2016 |  | — |  |  | 46.6 |
4.65% MARAD bonds due 2020 |  | — |  |  | 27.0 |
Total debt |  | 5,895.1 |  |  | 5,920.4 |
Less current maturities |  | — |  |  | (34.8 | )
Total long-term debt |  | $ | 5,895.1 |  |  | $ | 5,885.6 |
Aggregate Maturities Of Long-Term Debt | The aggregate maturities of our debt, excluding net unamortized premiums of $195.1 million, as of December 31, 2015 were as follows (in millions):
2016 |  | $ | — |
2017 |  | — |
2018 |  | — |
2019 |  | 500.0 |
2020 |  | 900.0 |
Thereafter |  | 4,300.0 |
Total |  | $ | 5,700.0 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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