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Debt Tender Offers (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Extinguishment of Debt [Line Items]
Tender Offer	$ 750.0
Debt Instrument, Repurchased Face Amount	940.2
Debt Instrument, Repurchase Amount	$ 684.8
Discount on Principal	27.16443%
Tender Offer [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 860.7
Debt Instrument, Repurchase Amount	$ 622.3
Eight Point Five Zero Percent Senior Notes Member
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.50%	8.50%
Debt Instrument, Repurchased Face Amount	$ 45.7
Debt Instrument, Repurchase Amount	$ 38.3
Discount on Principal	16.19256%
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%	6.875%
Debt Instrument, Repurchased Face Amount	$ 140.1
Debt Instrument, Repurchase Amount	$ 103.7
Discount on Principal	25.98144%
Four Point Seven Zero Percent Senior Notes Member
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.70%	4.70%
Debt Instrument, Repurchased Face Amount	$ 722.0
Debt Instrument, Repurchase Amount	$ 525.1
Discount on Principal	27.27147%
Four Point Five Percent Senior Notes Member [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.50%	4.50%
Debt Instrument, Repurchased Face Amount	$ 1.7
Debt Instrument, Repurchase Amount	$ 0.9
Discount on Principal	47.05882%
Five Point Two Percent Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.20%	5.20%
Debt Instrument, Repurchased Face Amount	$ 30.7
Debt Instrument, Repurchase Amount	$ 16.8
Discount on Principal	45.27687%
Open Market Repurchase [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 79.5
Debt Instrument, Repurchase Amount	$ 62.5

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- Definition

Discount on Principal

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- Definition

Tender Offer

+ References

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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

Fair value amount of debt instrument that was repurchased.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

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