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Debt (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Gain (Loss) on Extinguishment of Debt | $ 260,800,000 | $ (33,500,000) |
Debt Instrument, Repurchased Face Amount | 940,200,000 |  |
Debt Instrument, Repurchase Amount | 684,800,000 |  |
Five Point Two Percent Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 669,300,000 |  |
Debt Instrument, Repurchased Face Amount | $ 30,700,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.20% |  | 5.20%
Debt Instrument, Repurchase Amount | $ 16,800,000 |  |
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Gain (Loss) on Extinguishment of Debt | 260,800,000 |  |
Four Point Seven Zero Percent Senior Notes Member |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Repurchased Face Amount | $ 722,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% |  | 4.70%
Debt Instrument, Repurchase Amount | $ 525,100,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 778,000,000 |  |
Eight Point Five Zero Percent Senior Notes Member |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Repurchased Face Amount | $ 45,700,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.50% |  | 8.50%
Debt Instrument, Repurchase Amount | $ 38,300,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 454,300,000 |  |
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Repurchased Face Amount | $ 140,100,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% |  | 6.875%
Debt Instrument, Repurchase Amount | $ 103,700,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 759,900,000 |  |
Four Point Five Percent Senior Notes Member [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 623,200,000 |  |
Debt Instrument, Repurchased Face Amount | $ 1,700,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  | 4.50%
Debt Instrument, Repurchase Amount | $ 900,000 |  |
Revolving Credit Facility [Member] | Five Year Credit Facility Member |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 2,750,000,000 |  |
Line of Credit Facility, Current Borrowing Capacity | $ 2,250,000,000 |  |
Maximum Percent of Debt to Total Capitalization Ratio | 60.00% |  |
Line of Credit Facility, Commitment Fee Percentage | 0.225% |  |
Line of Credit Facility, Fair Value of Amount Outstanding | $ 0 |  | $ 0
Revolving Credit Facility [Member] | Base Rate [Member] | Five Year Credit Facility Member |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Credit Facility Member |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |  |

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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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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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