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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 4,994.9	$ 4,750.7
Estimated Fair Value	$ 4,505.2	$ 4,271.8
8.50% Senior notes due 2019(1)
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	$ 0.0	$ 251.4
Estimated Fair Value	$ 0.0	$ 252.9
6.875% Senior notes due 2020(2)
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	$ 128.9	$ 477.9
Estimated Fair Value	$ 128.3	$ 473.1
4.70% Senior notes due 2021(2)
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	$ 112.6	$ 267.1
Estimated Fair Value	$ 110.7	$ 265.3
3.00% Exchangeable senior notes due 2024(3)
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	$ 651.1	$ 635.7
Estimated Fair Value	793.2	757.1
3.00% Exchangeable senior notes due 2024(3) | 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	$ 835.1	$ 834.0
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	$ 619.5	$ 619.3
Estimated Fair Value	$ 516.5	$ 527.1
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%	8.00%
Carrying Value	$ 337.4	$ 337.9
Estimated Fair Value	$ 334.2	$ 333.8
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	$ 664.0	$ 663.6
Estimated Fair Value	$ 557.7	$ 571.4
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	$ 149.3	$ 149.3
Estimated Fair Value	$ 136.9	$ 141.9
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	$ 375.9	$ 376.7
Estimated Fair Value	$ 270.6	$ 258.8
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	$ 972.3	$ 971.8
Estimated Fair Value	$ 709.5	$ 690.4
7.75% Senior notes due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	7.75%	7.75%
Carrying Value	$ 983.9	$ 0.0
Estimated Fair Value	$ 947.6	$ 0.0

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ 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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