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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 4,747.7 | $ 5,274.5
Estimated Fair Value | $ 4,251.0 | $ 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 | $ 253.7 | $ 480.2
Estimated Fair Value | $ 252.3 | $ 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 | $ 480.3 | $ 735.9
Estimated Fair Value | $ 465.2 | $ 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 | $ 266.9 | $ 674.4
Estimated Fair Value | $ 264.6 | $ 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 | $ 628.2 | $ 604.3
Estimated Fair Value | $ 726.8 | $ 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 | $ 619.1 | $ 618.6
Estimated Fair Value | $ 520.2 | 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 | $ 338.2 | 0.0
Estimated Fair Value | $ 330.2 | $ 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 | $ 663.4 | $ 662.8
Estimated Fair Value | $ 564.0 | $ 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 | $ 139.2 | $ 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 | $ 377.1 | $ 378.3
Estimated Fair Value | $ 256.6 | $ 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 | $ 971.6 | $ 970.8
Estimated Fair Value | 731.9 | 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 | $ 833.5 | $ 830.1

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