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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, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 5,274.5	$ 5,868.6
Debt instrument, Fair Value Disclosure		5,001.7	4,621.9
8.50% Senior notes due 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		480.2	566.4
Debt instrument, Fair Value Disclosure		$ 485.0	510.2
Debt instrument, interest rate, stated percentage		8.50%
Debt Instrument, Maturity Date, Description		2019
6.875% Senior notes due 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 735.9	990.9
Debt instrument, Fair Value Disclosure		$ 727.5	850.5
Debt instrument, interest rate, stated percentage		6.875%
Debt Instrument, Maturity Date, Description		2020
4.70% Senior notes due 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 674.4	1,476.7
Debt instrument, Fair Value Disclosure		$ 658.9	1,254.0
Debt instrument, interest rate, stated percentage		4.70%
Debt Instrument, Maturity Date, Description		2021
3.00% Exchangeable senior notes due 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument, interest rate, stated percentage		3.00%
Debt Instrument, Maturity Date, Description		2024
3.00% Exchangeable senior notes due 2024 | Convertible Debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 604.3	0.0
Convertible Debt, Fair Value Disclosures	[1]	874.7	0.0
3.00% exchangeable senior notes, excluding discount and net of debt issuance costs		$ 830.1
Debt instrument, interest rate, stated percentage		8.00%
4.50% Senior notes due 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 618.6	619.7
Debt instrument, Fair Value Disclosure		$ 536.0	417.4
Debt instrument, interest rate, stated percentage		4.50%
Debt Instrument, Maturity Date, Description		2024
5.20% Senior notes due 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 662.8	692.5
Debt instrument, Fair Value Disclosure		$ 582.3	505.2
Debt instrument, interest rate, stated percentage		5.20%
Debt Instrument, Maturity Date, Description		2025
7.20% Senior notes due 2027
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 149.2	149.1
Debt instrument, Fair Value Disclosure		$ 138.7	133.5
Debt instrument, interest rate, stated percentage		7.20%
Debt Instrument, Maturity Date, Description		2027
7.875% Senior notes due 2040
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 378.3	379.8
Debt instrument, Fair Value Disclosure		$ 270.6	244.0
Debt instrument, interest rate, stated percentage		7.875%
Debt Instrument, Maturity Date, Description		2040
5.75% Senior notes due 2044
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 970.8	993.5
Debt instrument, Fair Value Disclosure		$ 728.0	$ 707.1
Debt instrument, interest rate, stated percentage		5.75%
Debt Instrument, Maturity Date, Description		2044
[1] Our 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 $830.1 million as of December 31, 2016. See "Note 4 - Debt" for additional information on this issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Contractual interest rate for funds borrowed, under the debt agreement.

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