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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 4,987.3 | $ 4,750.7
Estimated Fair Value | 4,292.8 | 4,271.8
8.50% senior notes due 2019 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 0.0 | 251.4
Estimated Fair Value | $ 0.0 | $ 252.9
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 | $ 129.6 | $ 477.9
Estimated Fair Value | $ 128.6 | $ 473.1
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 | $ 112.5 | $ 267.1
Estimated Fair Value | $ 110.8 | $ 265.3
Debt instrument, interest rate, stated percentage | 4.70% | 4.70%
3.00% exchangeable senior notes due 2024(2) |  |
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(2) | 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 | $ 834.6 |
Carrying Value | 643.3 | $ 635.7
Estimated Fair Value | 683.8 | 757.1
4.50% Senior Notes due 2024 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | 619.4 | 619.3
Estimated Fair Value | $ 501.6 | $ 527.1
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 | $ 337.7 | $ 337.9
Estimated Fair Value | $ 320.9 | $ 333.8
Debt instrument, interest rate, stated percentage | 8.00% | 8.00%
5.20% Senior Notes due 2025 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 663.8 | $ 663.6
Estimated Fair Value | $ 545.8 | $ 571.4
Debt instrument, interest rate, stated percentage | 5.20% | 5.20%
7.75% senior notes due 2026 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 983.4 | $ 0.0
Estimated Fair Value | $ 923.4 | 0.0
Debt instrument, interest rate, stated percentage | 7.75% |
7.20% Debentures due 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 149.2 | 149.3
Estimated Fair Value | $ 134.2 | $ 141.9
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 | $ 376.3 | $ 376.7
Estimated Fair Value | $ 256.1 | $ 258.8
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 | $ 972.1 | $ 971.8
Estimated Fair Value | $ 687.6 | $ 690.4
Debt instrument, interest rate, stated percentage | 5.75% | 5.75%

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