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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 5,925.7	$ 5,920.4
Estimated Fair Value	$ 6,005.2	$ 5,973.4
Three Point Two Five Percent Senior Notes Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%	3.25%
Carrying Value	$ 0.0	$ 998.0
Estimated Fair Value	$ 0.0	$ 1,018.3
Four Point Six Five Percent Marine Administration Bonds Including Current Maturities Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.65%	4.65%
Carrying Value	$ 0.0	$ 27.0
Estimated Fair Value	$ 0.0	$ 29.7
Four Point Three Three Percent Marine Administration Bonds Including Current Maturities Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.33%	4.33%
Carrying Value	$ 14.4	$ 46.6
Estimated Fair Value	$ 14.5	$ 46.8
Seven Point Two Zero Percent Debentures Member
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	$ 177.2	$ 171.4
Seven Point Eight Seven Five Percent Senior Notes Member
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	$ 380.5	$ 381.2
Estimated Fair Value	$ 333.0	$ 363.8
Eight Point Five Zero Percent Senior Notes Member
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	$ 575.2	$ 583.8
Estimated Fair Value	$ 593.0	$ 611.8
Four Point Five Percent Senior Notes Member [Member]
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	$ 624.2	$ 624.2
Estimated Fair Value	$ 592.3	$ 602.0
Five Point Two Percent Senior Notes [Member]
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	$ 697.4	$ 0.0
Estimated Fair Value	$ 696.4	$ 0.0
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member
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	$ 999.7	$ 1,008.2
Estimated Fair Value	$ 1,029.1	$ 1,008.5
Five Point Seven Five Percent Senior Notes [Member]
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	$ 1,003.8	$ 622.3
Estimated Fair Value	$ 1,015.6	$ 615.8
Four Point Seven Zero Percent Senior Notes Member
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	$ 1,481.3	$ 1,479.9
Estimated Fair Value	$ 1,554.1	$ 1,505.3

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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



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-Topic 825



-SubTopic 10



-Section 50



-Paragraph 12



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- Definition

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))



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