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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Jan. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | $ 4,943.5 |  | $ 5,274.5
Estimated Fair Value | 4,665.7 |  | 5,001.7
8.50% Senior Notes due 2019 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | 317.6 |  | 480.2
Estimated Fair Value | $ 319.5 |  | $ 485.0
Debt instrument, interest rate, stated percentage | 8.50% |  | 8.50%
6.875% Senior Notes due 2020 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | $ 592.8 |  | $ 735.9
Estimated Fair Value | $ 577.0 |  | $ 727.5
Debt instrument, interest rate, stated percentage | 6.875% |  | 6.875%
4.70% Senior notes due 2021 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | $ 301.1 |  | $ 674.4
Estimated Fair Value | $ 298.0 |  | $ 658.9
Debt instrument, interest rate, stated percentage | 4.70% |  | 4.70%
3.00% Exchangeable senior notes due 2024(1) | Convertible Debt [Member] |  |  |
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 | $ 832.5 |  |
Carrying Value | 613.5 |  | $ 604.3
Estimated Fair Value | 834.6 |  | 874.7
4.50% Senior Notes due 2024 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | 618.7 |  | 618.6
Estimated Fair Value | $ 530.1 |  | $ 536.0
Debt instrument, interest rate, stated percentage | 4.50% |  | 4.50%
8.00% Senior notes due 2024 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | $ 338.7 |  | $ 0.0
Estimated Fair Value | $ 335.7 |  | 0.0
Debt instrument, interest rate, stated percentage | 8.00% |  |
8.00% Senior notes due 2024 [Member] | Convertible Debt [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt instrument, interest rate, stated percentage |  | 8.00% |
5.20% Senior Notes due 2025 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | $ 663.0 |  | 662.8
Estimated Fair Value | $ 583.6 |  | $ 582.3
Debt instrument, interest rate, stated percentage | 5.20% |  | 5.20%
7.20% Debentures due 2027 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | $ 149.2 |  | $ 149.2
Estimated Fair Value | $ 147.6 |  | $ 138.7
Debt instrument, interest rate, stated percentage | 7.20% |  | 7.20%
7.875% Senior notes due 2040 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | $ 377.9 |  | $ 378.3
Estimated Fair Value | $ 278.2 |  | $ 270.6
Debt instrument, interest rate, stated percentage | 7.875% |  | 7.875%
5.75% Senior notes due 2044 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying Value | $ 971.0 |  | $ 970.8
Estimated Fair Value | $ 761.4 |  | $ 728.0
Debt instrument, interest rate, stated percentage | 5.75% |  | 5.75%

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