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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Value | $ 4,994.9 | $ 4,750.7
Estimated Fair Value | $ 4,505.2 | $ 4,271.8
8.50% Senior notes due 2019(1) |  |
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 | $ 0.0 | $ 251.4
Estimated Fair Value | $ 0.0 | $ 252.9
6.875% Senior notes due 2020(2) |  |
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 | $ 128.9 | $ 477.9
Estimated Fair Value | $ 128.3 | $ 473.1
4.70% Senior notes due 2021(2) |  |
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 | $ 112.6 | $ 267.1
Estimated Fair Value | $ 110.7 | $ 265.3
3.00% Exchangeable senior notes due 2024(3) |  |
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 | $ 651.1 | $ 635.7
Estimated Fair Value | 793.2 | 757.1
3.00% Exchangeable senior notes due 2024(3) | 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 | $ 835.1 | $ 834.0
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 | $ 619.5 | $ 619.3
Estimated Fair Value | $ 516.5 | $ 527.1
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% | 8.00%
Carrying Value | $ 337.4 | $ 337.9
Estimated Fair Value | $ 334.2 | $ 333.8
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 | $ 664.0 | $ 663.6
Estimated Fair Value | $ 557.7 | $ 571.4
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 | $ 149.3 | $ 149.3
Estimated Fair Value | $ 136.9 | $ 141.9
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 | $ 375.9 | $ 376.7
Estimated Fair Value | $ 270.6 | $ 258.8
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 | $ 972.3 | $ 971.8
Estimated Fair Value | $ 709.5 | $ 690.4
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 | $ 983.9 | $ 0.0
Estimated Fair Value | $ 947.6 | $ 0.0

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