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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 4,744.7 | $ 5,274.5
Estimated Fair Value | $ 4,046.9 | $ 5,001.7
8.50% Senior notes due 2019 |  |
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 | $ 256.0 | $ 480.2
Estimated Fair Value | $ 255.0 | $ 485.0
6.875% Senior notes due 2020 |  |
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 | $ 482.7 | $ 735.9
Estimated Fair Value | $ 461.8 | $ 727.5
4.70% Senior notes due 2021 |  |
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 | $ 266.7 | $ 674.4
Estimated Fair Value | $ 264.0 | $ 658.9
3.00% Exchangeable senior notes due 2024 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% | 3.00%
Carrying Value | $ 620.7 | $ 604.3
Estimated Fair Value | $ 666.9 | $ 874.7
4.50% Senior notes due 2024 |  |
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 | $ 619.0 | $ 618.6
Estimated Fair Value | $ 487.2 | 536.0
8.00% Senior notes due 2024 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |
Carrying Value | $ 338.4 | 0.0
Estimated Fair Value | $ 314.7 | $ 0.0
5.20% Senior notes due 2025 |  |
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 | $ 663.2 | $ 662.8
Estimated Fair Value | $ 543.9 | $ 582.3
7.20% Debentures due 2027 |  |
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 | $ 149.2 | $ 149.2
Estimated Fair Value | $ 137.3 | $ 138.7
7.875% Senior notes due 2040 |  |
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 | $ 377.5 | $ 378.3
Estimated Fair Value | $ 246.5 | $ 270.6
5.75% Senior notes due 2044 |  |
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 | $ 971.3 | $ 970.8
Estimated Fair Value | 669.6 | 728.0
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
3.00% exchangeable senior notes, excluding discount and net of debt issuance costs | $ 832.9 | $ 830.1

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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=77997519&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=77997519&loc=d3e13476-108611 + Details
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