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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2014
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 net financial assets measured at fair value on a recurring basis as of December 31, 2014 and 2013 (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, 2014 |  |  |  |  |  |  |  |  |  |  |
Supplemental executive retirement plan assets | $ | 43.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 43.2 |
Total financial assets | $ | 43.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 43.2 |
Derivatives, net | — |  |  | (26.3 | ) |  | — |  |  | (26.3 | )
Total financial liabilities | $ | — |  |  | $ | (26.3 | ) |  | $ | — |  |  | $ | (26.3 | )
As of December 31, 2013 |  |  |  |  |  |  |  |  |  |  |
Supplemental executive retirement plan assets | $ | 37.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 37.7 |
Derivatives, net | — |  |  | 1.8 |  |  | — |  |  | 1.8 |
Total financial assets | $ | 37.7 |  |  | $ | 1.8 |  |  | $ | — |  |  | $ | 39.5 |
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments | The carrying values and estimated fair values of our debt instruments as of December 31, 2014 and 2013 were as follows (in millions):
|  | December 31, 2014 |  | December 31, 2013
|  | Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
4.70% Senior notes due 2021 |  | $ | 1,479.9 |  |  | $ | 1,505.3 |  |  | $ | 1,477.2 |  |  | $ | 1,596.9 |
6.875% Senior notes due 2020 |  | 1,008.2 |  |  | 1,008.5 |  |  | 1,024.8 |  |  | 1,086.7 |
3.25% Senior notes due 2016 |  | 998.0 |  |  | 1,018.3 |  |  | 996.5 |  |  | 1,045.8 |
4.50% Senior notes due 2024 |  | 624.2 |  |  | 602.0 |  |  | — |  |  | — |
5.75% Senior notes due 2044 |  | 622.3 |  |  | 615.8 |  |  | — |  |  | — |
8.50% Senior notes due 2019 |  | 583.8 |  |  | 611.8 |  |  | 600.5 |  |  | 635.8 |
7.875% Senior notes due 2040 |  | 381.2 |  |  | 363.8 |  |  | 382.6 |  |  | 410.5 |
7.20% Debentures due 2027 |  | 149.2 |  |  | 171.4 |  |  | 149.1 |  |  | 178.6 |
4.33% MARAD bonds, including current maturities, due 2016 |  | 46.6 |  |  | 46.8 |  |  | 78.9 |  |  | 79.7 |
6.36% MARAD bonds, including current maturities, due 2015 |  | — |  |  | — |  |  | 25.3 |  |  | 27.1 |
4.65% MARAD bonds, including current maturities, due 2020 |  | 27.0 |  |  | 29.7 |  |  | 31.5 |  |  | 35.2 |
Total |  | $ | 5,920.4 |  |  | $ | 5,973.4 |  |  | $ | 4,766.4 |  |  | $ | 5,096.3 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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