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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 5,895.1 | $ 5,920.4
Debt instrument | 4,621.9 | 5,973.4
4.70% Senior notes due 2021 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | 1,482.7 | 1,479.9
Debt instrument | $ 1,254.0 | 1,505.3
Debt instrument, interest rate, stated percentage | 4.70% |
Debt instrument maturity period | 2021 |
6.875% Senior notes due 2020 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 990.9 | 1,008.2
Debt instrument | $ 850.5 | 1,008.5
Debt instrument, interest rate, stated percentage | 6.875% |
Debt instrument maturity period | 2020 |
3.25% Senior notes due 2016 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 0.0 | 998.0
Debt instrument | $ 0.0 | 1,018.3
Debt instrument, interest rate, stated percentage | 3.25% |
Debt instrument maturity period | 2016 |
Four Point Five Percent Senior Notes Member [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 624.3 | 624.2
Debt instrument | $ 417.4 | 602.0
Debt instrument, interest rate, stated percentage | 4.50% |
Debt instrument maturity period | 2024 |
Five Point Seven Five Percent Senior Notes [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 1,004.2 | 622.3
Debt instrument | $ 707.1 | 615.8
Debt instrument, interest rate, stated percentage | 5.75% |
Debt instrument maturity period | 2044 |
8.50% Senior notes due 2019 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 566.4 | 583.8
Debt instrument | $ 510.2 | 611.8
Debt instrument, interest rate, stated percentage | 8.50% |
Debt instrument maturity period | 2019 |
7.875% Senior notes due 2040 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 379.8 | 381.2
Debt instrument | $ 244.0 | 363.8
Debt instrument, interest rate, stated percentage | 7.875% |
Debt instrument maturity period | 2040 |
7.20% Debentures due 2027 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 149.2 | 149.2
Debt instrument | $ 133.5 | 171.4
Debt instrument, interest rate, stated percentage | 7.20% |
Debt instrument maturity period | 2027 |
4.33% MARAD bonds due 2016 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 0.0 | 46.6
Debt instrument | $ 0.0 | 46.8
Debt instrument, interest rate, stated percentage | 4.33% |
Debt instrument maturity period | 2016 |
4.33% MARAD bonds, including current maturities, due 2016 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 697.6 | 0.0
Debt instrument | $ 505.2 | 0.0
Debt instrument, interest rate, stated percentage | 5.20% |
Debt instrument maturity period | 2025 |
4.65% MARAD bonds, including current maturities, due 2020 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument Carrying Value | $ 0.0 | 27.0
Debt instrument | $ 0.0 | $ 29.7
Debt instrument, interest rate, stated percentage | 4.65% |
Debt instrument maturity period | 2020 |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: 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=49121117&loc=d3e13433-108611 Reference 2: 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=49121117&loc=d3e13476-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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