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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 5,018.5 | $ 5,010.4
Estimated Fair Value | $ 4,042.9 | $ 3,545.8
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 | $ 126.9 | $ 127.5
Estimated Fair Value | $ 122.8 | $ 121.6
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 | $ 112.9 | $ 112.7
Estimated Fair Value | $ 108.5 | $ 101.8
3.00% exchangeable senior notes due 2024(1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% | 3.00%
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 | $ 836.9 |
Carrying Value | 674.7 | $ 666.8
Estimated Fair Value | $ 655.5 | $ 575.5
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 | $ 620.0 | $ 619.8
Estimated Fair Value | $ 476.0 | $ 405.2
8.00% senior notes due 2024 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% | 8.00%
Carrying Value | $ 336.7 | $ 337.0
Estimated Fair Value | $ 305.1 | $ 273.7
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 | $ 664.6 | $ 664.4
Estimated Fair Value | $ 517.7 | $ 443.9
7.75% senior notes due 2026 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.75% | 7.75%
Carrying Value | $ 985.6 | $ 985.0
Estimated Fair Value | $ 849.8 | $ 725.5
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 | $ 149.4 | $ 149.3
Estimated Fair Value | $ 121.1 | $ 109.1
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 | $ 374.6 | $ 375.0
Estimated Fair Value | $ 238.2 | $ 223.2
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 | $ 973.1 | $ 972.9
Estimated Fair Value | $ 648.2 | $ 566.3

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