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Debt Tender Offers (Details) - USD ($)	Apr. 05, 2016	Mar. 31, 2016	Dec. 31, 2015
8.50% Senior Notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.50%
6.875% Senior Notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.875%	6.875%
4.70% Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.70%
4.50% Senior Notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.50%	4.50%
5.20% Senior Notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.20%	5.20%
Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 860,700,000
Debt Instrument, Repurchase Amount	622,300,000
Discount on Principal	0.277
Subsequent Event [Member] | 8.50% Senior Notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	45,700,000
Debt Instrument, Repurchase Amount	38,300,000
Discount on Principal	0.162
Subsequent Event [Member] | 6.875% Senior Notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	140,100,000
Debt Instrument, Repurchase Amount	103,700,000
Discount on Principal	0.260
Subsequent Event [Member] | 4.70% Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	642,500,000
Debt Instrument, Repurchase Amount	462,600,000
Discount on Principal	0.280
Subsequent Event [Member] | 4.50% Senior Notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	1,700,000
Debt Instrument, Repurchase Amount	900,000
Discount on Principal	0.471
Subsequent Event [Member] | 5.20% Senior Notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	30,700,000
Debt Instrument, Repurchase Amount	16,800,000
Discount on Principal	$ 0.453

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+ 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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