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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 5,010.4 | $ 4,750.7
Debt instrument, Fair Value Disclosure |  | 3,545.8 | 4,271.8
8.50% Senior notes due 2019(1) |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | 0.0 | 251.4
Debt instrument, Fair Value Disclosure |  | $ 0.0 | 252.9
Debt instrument, interest rate, stated percentage |  | 8.50% |
Senior Note Maturity Year |  | 2019 |
6.875% Senior notes due 2020(1) |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 127.5 | 477.9
Debt instrument, Fair Value Disclosure |  | $ 121.6 | 473.1
Debt instrument, interest rate, stated percentage |  | 6.875% |
Senior Note Maturity Year |  | 2020 |
4.70% Senior notes due 2021(1) |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 112.7 | 267.1
Debt instrument, Fair Value Disclosure |  | $ 101.8 | 265.3
Debt instrument, interest rate, stated percentage |  | 4.70% |
Senior Note Maturity Year |  | 2021 |
3.00% Exchangeable senior notes due 2024(2) |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt instrument, interest rate, stated percentage |  | 3.00% |
Senior Note Maturity Year |  | 2024 |
3.00% Exchangeable senior notes due 2024(2) | Convertible Debt [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 666.8 | 635.7
Convertible Debt, Fair Value Disclosures | [1] | 575.5 | 757.1
3.00% exchangeable senior notes, excluding discount and net of debt issuance costs |  | $ 836.3 | 834.0
Debt instrument, interest rate, stated percentage |  | 8.00% |
Senior Note Maturity Year |  | 2024 |
4.50% Senior notes due 2024 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 619.8 | 619.3
Debt instrument, Fair Value Disclosure |  | $ 405.2 | 527.1
Debt instrument, interest rate, stated percentage |  | 4.50% |
Senior Note Maturity Year |  | 2024 |
8.00% Senior notes due 2024 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 337.0 | 337.9
Debt instrument, Fair Value Disclosure |  | $ 273.7 | 333.8
Debt instrument, interest rate, stated percentage |  | 8.00% |
Senior Note Maturity Year |  | 2024 |
5.20% Senior notes due 2025 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 664.4 | 663.6
Debt instrument, Fair Value Disclosure |  | $ 443.9 | 571.4
Debt instrument, interest rate, stated percentage |  | 5.20% |
Senior Note Maturity Year |  | 2025 |
7.75% Senior notes due 2026 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 985.0 | 0.0
Debt instrument, Fair Value Disclosure |  | 725.5 | 0.0
7.20% Senior notes due 2027 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | 149.3 | 149.3
Debt instrument, Fair Value Disclosure |  | $ 109.1 | 141.9
Debt instrument, interest rate, stated percentage |  | 7.20% |
Senior Note Maturity Year |  | 2027 |
7.875% Senior notes due 2040 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 375.0 | 376.7
Debt instrument, Fair Value Disclosure |  | $ 223.2 | 258.8
Debt instrument, interest rate, stated percentage |  | 7.875% |
Senior Note Maturity Year |  | 2040 |
5.75% Senior notes due 2044 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt Instrument Carrying Value |  | $ 972.9 | 971.8
Debt instrument, Fair Value Disclosure |  | $ 566.3 | $ 690.4
Debt instrument, interest rate, stated percentage |  | 5.75% |
Senior Note Maturity Year |  | 2044 |
[1] | Our 3.00% exchangeable senior notes due 2024 (the "2024 Convertible Notes") were issued with a conversion feature. The 2024 Convertible Notes were separated into their liability and equity components on our consolidated balance sheet. The equity component was initially recorded to additional paid-in capital and as a debt discount, which will be amortized to interest expense. Excluding the unamortized discount, the carrying value of the 2024 Convertible Notes was $836.3 million and $834.0 million as of December 31, 2018 and 2017. See "Note 6 - Debt" for additional information on this issuance.

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