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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 4,987.3	$ 4,750.7
Estimated Fair Value	4,292.8	4,271.8
8.50% senior notes due 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	0.0	251.4
Estimated Fair Value	$ 0.0	$ 252.9
Debt instrument, interest rate, stated percentage	8.50%	8.50%
6.875% senior notes due 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 129.6	$ 477.9
Estimated Fair Value	$ 128.6	$ 473.1
Debt instrument, interest rate, stated percentage	6.875%	6.875%
4.70% senior notes due 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 112.5	$ 267.1
Estimated Fair Value	$ 110.8	$ 265.3
Debt instrument, interest rate, stated percentage	4.70%	4.70%
3.00% exchangeable senior notes due 2024(2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage	3.00%	3.00%
3.00% exchangeable senior notes due 2024(2) | 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	$ 834.6
Carrying Value	643.3	$ 635.7
Estimated Fair Value	683.8	757.1
4.50% Senior Notes due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	619.4	619.3
Estimated Fair Value	$ 501.6	$ 527.1
Debt instrument, interest rate, stated percentage	4.50%	4.50%
8.00% senior notes due 2024 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 337.7	$ 337.9
Estimated Fair Value	$ 320.9	$ 333.8
Debt instrument, interest rate, stated percentage	8.00%	8.00%
5.20% Senior Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 663.8	$ 663.6
Estimated Fair Value	$ 545.8	$ 571.4
Debt instrument, interest rate, stated percentage	5.20%	5.20%
7.75% senior notes due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 983.4	$ 0.0
Estimated Fair Value	$ 923.4	0.0
Debt instrument, interest rate, stated percentage	7.75%
7.20% Debentures due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 149.2	149.3
Estimated Fair Value	$ 134.2	$ 141.9
Debt instrument, interest rate, stated percentage	7.20%	7.20%
7.875% senior notes due 2040
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 376.3	$ 376.7
Estimated Fair Value	$ 256.1	$ 258.8
Debt instrument, interest rate, stated percentage	7.875%	7.875%
5.75% senior notes due 2044
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 972.1	$ 971.8
Estimated Fair Value	$ 687.6	$ 690.4
Debt instrument, interest rate, stated percentage	5.75%	5.75%

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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
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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