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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, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 4,750.7	$ 5,274.5
Debt instrument, Fair Value Disclosure		4,271.8	5,001.7
8.50% Senior notes due 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		251.4	480.2
Debt instrument, Fair Value Disclosure		$ 252.9	485.0
Debt instrument, interest rate, stated percentage		8.50%
Senior Note Maturity Year		2019
6.875% Senior notes due 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 477.9	735.9
Debt instrument, Fair Value Disclosure		$ 473.1	727.5
Debt instrument, interest rate, stated percentage		6.875%
Senior Note Maturity Year		2020
4.70% Senior notes due 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 267.1	674.4
Debt instrument, Fair Value Disclosure		$ 265.3	658.9
Debt instrument, interest rate, stated percentage		4.70%
Senior Note Maturity Year		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%
Senior Note Maturity Year		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		$ 635.7	604.3
Convertible Debt, Fair Value Disclosures	[1]	757.1	874.7
3.00% exchangeable senior notes, excluding discount and net of debt issuance costs		$ 834.0	830.1
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		$ 619.3	618.6
Debt instrument, Fair Value Disclosure		$ 527.1	536.0
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		$ 337.9	0.0
Debt instrument, Fair Value Disclosure		$ 333.8	0.0
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		$ 663.6	662.8
Debt instrument, Fair Value Disclosure		$ 571.4	582.3
Debt instrument, interest rate, stated percentage		5.20%
Senior Note Maturity Year		2025
7.20% Senior notes due 2027
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value		$ 149.3	149.2
Debt instrument, Fair Value Disclosure		$ 141.9	138.7
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		$ 376.7	378.3
Debt instrument, Fair Value Disclosure		$ 258.8	270.6
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		$ 971.8	970.8
Debt instrument, Fair Value Disclosure		$ 690.4	$ 728.0
Debt instrument, interest rate, stated percentage		5.75%
Senior Note Maturity Year		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 $834.0 million and $830.1 million as of December 31, 2017 and 2016. See "Note 5 - Debt" for additional information on this issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
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-Paragraph 10
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