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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 4,744.7	$ 5,274.5
Estimated Fair Value	$ 4,046.9	$ 5,001.7
8.50% Senior notes due 2019
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	$ 256.0	$ 480.2
Estimated Fair Value	$ 255.0	$ 485.0
6.875% Senior notes due 2020
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	$ 482.7	$ 735.9
Estimated Fair Value	$ 461.8	$ 727.5
4.70% Senior notes due 2021
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	$ 266.7	$ 674.4
Estimated Fair Value	$ 264.0	$ 658.9
3.00% Exchangeable senior notes due 2024
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	$ 620.7	$ 604.3
Estimated Fair Value	$ 666.9	$ 874.7
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	$ 619.0	$ 618.6
Estimated Fair Value	$ 487.2	536.0
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%
Carrying Value	$ 338.4	0.0
Estimated Fair Value	$ 314.7	$ 0.0
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	$ 663.2	$ 662.8
Estimated Fair Value	$ 543.9	$ 582.3
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	$ 149.2	$ 149.2
Estimated Fair Value	$ 137.3	$ 138.7
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	$ 377.5	$ 378.3
Estimated Fair Value	$ 246.5	$ 270.6
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	$ 971.3	$ 970.8
Estimated Fair Value	669.6	728.0
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024
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	$ 832.9	$ 830.1

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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