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Guarantee Of Registered Securities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Guarantor Obligations [Line Items]
Senior notes aggregate outstanding principal balance	$ 1,700.0
8.50% Senior Notes [Member]
Guarantor Obligations [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.50%
Debt Instrument, Maturity Date	2019
6.875% Senior Notes due 2020
Guarantor Obligations [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%	6.875%
Debt Instrument, Maturity Date	2020
7.875% Senior Notes [Member]
Guarantor Obligations [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.875%	7.875%
Debt Instrument, Maturity Date	2040
7.20% Debentures due 2027
Guarantor Obligations [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.20%	7.20%
Debt Instrument, Maturity Date	2027
Senior notes aggregate outstanding principal balance	$ 150.0

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- Definition

Senior Note Maturity Year

+ References

No definition available.

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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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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