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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 5,861.0	$ 5,868.6
Estimated Fair Value	3,648.5	4,621.9
4.70% Senior notes due 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	1,477.8	1,476.7
Estimated Fair Value	$ 1,048.1	$ 1,254.0
Debt instrument, interest rate, stated percentage	4.70%	4.70%
5.75% Senior notes due 2044
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 993.7	$ 993.5
Estimated Fair Value	$ 514.6	$ 707.1
Debt instrument, interest rate, stated percentage	5.75%	5.75%
6.875% Senior Notes due 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 986.5	$ 990.9
Estimated Fair Value	$ 663.8	$ 850.5
Debt instrument, interest rate, stated percentage	6.875%	6.875%
5.20% Senior Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 692.7	$ 692.5
Estimated Fair Value	$ 389.4	$ 505.2
Debt instrument, interest rate, stated percentage	5.20%	5.20%
4.50% Senior Notes due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 619.9	$ 619.7
Estimated Fair Value	$ 349.7	$ 417.4
Debt instrument, interest rate, stated percentage	4.50%	4.50%
8.50% Senior notes due 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 561.9	$ 566.4
Estimated Fair Value	$ 441.8	$ 510.2
Debt instrument, interest rate, stated percentage	8.50%	8.50%
7.875% Senior notes due 2040
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 379.4	$ 379.8
Estimated Fair Value	$ 161.6	$ 244.0
Debt instrument, interest rate, stated percentage	7.875%	7.875%
7.20% Debentures due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 149.1	$ 149.1
Estimated Fair Value	$ 79.5	$ 133.5
Debt instrument, interest rate, stated percentage	7.20%	7.20%

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- Definition

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+ References

No definition available.

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- Definition

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=49121117&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=49121117&loc=d3e13476-108611

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- Definition

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

+ References

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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