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Debt (Schedule Of Long-Term Debt Instruments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 5,274.5	$ 5,868.6
Debt, Long-term and Short-term, Combined Amount	5,274.5	5,868.6
Long-term Debt, Current Maturities	(331.9)	0.0
Long-term Debt, Excluding Current Maturities	4,942.6	5,868.6
8.50% Senior notes due 2019
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 480.2	566.4
Debt Instrument, Maturity Date, Description	2019
Debt instrument, interest rate, stated percentage	8.50%
6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 735.9	990.9
Debt Instrument, Maturity Date, Description	2020
Debt instrument, interest rate, stated percentage	6.875%
4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 674.4	1,476.7
Debt Instrument, Maturity Date, Description	2021
Debt instrument, interest rate, stated percentage	4.70%
3.00% Exchangeable senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Maturity Date, Description	2024
Debt instrument, interest rate, stated percentage	3.00%
3.00% Exchangeable senior notes due 2024 | Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 604.3	0.0
Debt instrument, interest rate, stated percentage	8.00%
4.50% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 618.6	619.7
Debt Instrument, Maturity Date, Description	2024
Debt instrument, interest rate, stated percentage	4.50%
5.20% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 662.8	692.5
Debt Instrument, Maturity Date, Description	2025
Debt instrument, interest rate, stated percentage	5.20%
7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 149.2	149.1
Debt Instrument, Maturity Date, Description	2027
Debt instrument, interest rate, stated percentage	7.20%
7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 378.3	379.8
Debt Instrument, Maturity Date, Description	2040
Debt instrument, interest rate, stated percentage	7.875%
5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt Instrument Carrying Value	$ 970.8	$ 993.5
Debt Instrument, Maturity Date, Description	2044
Debt instrument, interest rate, stated percentage	5.75%

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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))
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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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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)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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