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Debt (Schedule Of Long-Term Debt Instruments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 4,621.9	$ 5,973.4
Total	5,895.1	5,920.4
Less current maturities	0.0	(34.8)
Total long-term debt	5,895.1	5,885.6
4.70% Senior notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 1,254.0	1,505.3
Debt instrument interest rate stated percentage	4.70%
Debt instrument maturity period	2021
6.875% Senior notes due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 850.5	1,008.5
Debt instrument interest rate stated percentage	6.875%
Debt instrument maturity period	2020
3.25% Senior notes due 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 0.0	1,018.3
Debt instrument interest rate stated percentage	3.25%
Debt instrument maturity period	2016
Five Point Two Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 505.2	0.0
Debt instrument interest rate stated percentage	5.20%
Debt instrument maturity period	2025
Four Point Five Percent Senior Notes Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 417.4	602.0
Debt instrument interest rate stated percentage	4.50%
Debt instrument maturity period	2024
Five Point Seven Five Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 707.1	615.8
Debt instrument interest rate stated percentage	5.75%
Debt instrument maturity period	2044
8.50% Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 510.2	611.8
Debt instrument interest rate stated percentage	8.50%
Debt instrument maturity period	2019
7.875% Senior notes due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 244.0	363.8
Debt instrument interest rate stated percentage	7.875%
Debt instrument maturity period	2040
7.20% Debentures due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 133.5	171.4
Debt instrument interest rate stated percentage	7.20%
Debt instrument maturity period	2027
4.33% MARAD bonds due 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 0.0	46.8
Debt instrument interest rate stated percentage	4.33%
Debt instrument maturity period	2016
4.65% MARAD bonds due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 0.0	$ 29.7
Debt instrument interest rate stated percentage	4.65%
Debt instrument maturity period	2020

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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

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

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