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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 4,905.6 | $ 5,868.6
Estimated Fair Value | $ 3,707.0 | $ 4,621.9
Seven Point Two Zero Percent Debentures Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.20% | 7.20%
Carrying Value | $ 149.1 | $ 149.1
Estimated Fair Value | $ 115.9 | $ 133.5
Seven Point Eight Seven Five Percent Senior Notes Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.875% | 7.875%
Carrying Value | $ 379.1 | $ 379.8
Estimated Fair Value | $ 210.0 | $ 244.0
Eight Point Five Zero Percent Senior Notes Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.50% | 8.50%
Carrying Value | $ 506.5 | $ 566.4
Estimated Fair Value | $ 467.0 | $ 510.2
Four Point Five Percent Senior Notes Member [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% | 4.50%
Carrying Value | $ 618.3 | $ 619.7
Estimated Fair Value | $ 427.0 | $ 417.4
Five Point Two Percent Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.20% | 5.20%
Carrying Value | $ 662.4 | $ 692.5
Estimated Fair Value | $ 465.2 | $ 505.2
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% | 6.875%
Carrying Value | $ 829.1 | $ 990.9
Estimated Fair Value | $ 747.6 | $ 850.5
Five Point Seven Five Percent Senior Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% | 5.75%
Carrying Value | $ 994.0 | $ 993.5
Estimated Fair Value | $ 620.9 | $ 707.1
Four Point Seven Zero Percent Senior Notes Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% | 4.70%
Carrying Value | $ 767.1 | $ 1,476.7
Estimated Fair Value | $ 653.4 | $ 1,254.0

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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=73719730&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=73719730&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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