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Debt Tender Offers (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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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 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 + Details
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