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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 14, 2017 | Oct. 10, 2017 | Dec. 19, 2016 | Nov. 09, 2016 | May 29, 2015 | Dec. 24, 2014 | Feb. 14, 2013 | Feb. 29, 2012 | Dec. 10, 2007 | Sep. 30, 2017 | Jul. 01, 2017 | Dec. 31, 2016 | Sep. 24, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 26, 2015 | Jun. 27, 2015 | Dec. 25, 2010 | Apr. 01, 2017 | Jul. 01, 2015 | Jun. 27, 2015 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015 | Oct. 31, 2017 | Apr. 21, 2017 | Aug. 01, 2015 | Jul. 02, 2015 | Aug. 01, 2012 | Nov. 18, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed under revolver |  |  |  |  |  |  |  |  |  | $ 345,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 345,000,000 |  |  |  |  |  |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,400,000 | $ 52,100,000 | $ 63,800,000 |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  | (600,000) | 2,600,000 |  | $ 800,000 | $ 4,500,000 |  |  |  |  |  |  |  | 3,200,000 | 5,300,000 | 62,700,000 |  |  |  |  |  |
Payment of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (22,700,000) |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | 200,100,000 |  |  |  |  |  |  |  |  |  |  |  | 200,100,000 |  |  |  |  |  |  |  |
Amount repaid under revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,000,000 |  |  |  |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  |  | 269,100,000 | $ 12,300,000 |  |  |  |  |  |  |  |  |  | 396,200,000 | 392,800,000 | 543,700,000 |  |  |  |  |  |
Conversion premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,700,000 |  |  |  |  |  |  |  |  |  |  |
Adjustments to APIC, equity component of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (33,900,000) | $ (94,400,000) | $ (216,900,000) |  |  |  |  |  |
Penalty fee percentage |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |
Maximum number of shares subject to mandatory redemption (in shares) |  |  |  |  |  |  |  |  |  | 18.0 |  |  |  |  |  |  |  |  |  |  |  | 18.0 |  |  |  |  |  |  |  |
Period to remedy event of default |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |
Accretion expense |  |  |  |  |  |  |  |  |  |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  | $ 68,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 68,000,000 |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,300,000) |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  | 82,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 38.590 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion expense |  |  |  |  |  |  |  |  |  | 13,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,800,000,000 |
Proceeds under credit agreement |  |  |  |  | $ 1,680,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.39% | 2.08% | 2.43% |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,300,000 | $ 40,400,000 | $ 54,700,000 |  |  |  |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,200,000 | 4,400,000 | 9,000,000 |  |  |  |  |  |
Leverage ratio maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50 |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75 |  |  |  |  |  |  |  |
Decreased net leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00 |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum range of present value of cash flow, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,800,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Fees recorded as debt discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  |  |  |  | $ 1,670,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 1,670,000,000 |  |  |  |  |  |  | $ 2,500,000,000 |
Credit Agreement | Percentage Added to Eurodollar Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.73% |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57,300,000 | 56,000,000 | 67,200,000 |  |  |  |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,900,000 | $ 3,800,000 | 2,100,000 |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate during period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.25% |  |  |  |  |  |  |  |  |  |
Long-term debt obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Final interest payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,250,000 |  |  |
2022 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate during period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  |  |
Long-term debt obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Offering price, percentage of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Debt instrument, maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2022 |  |  |  |  |  |  |
Percentage of redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Maximum percentage of redemption of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |
Percentage of redemption price, second period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105.25% |  |
Percentage of redemption price, third period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102.625% |  |
Percentage of redemption price, fourth period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.313% |  |
Percentage of redemption price, fifth period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Percentage price of principal amount for repurchase of senior note |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes, reacquisition of equity component |  |  |  |  |  |  |  |  |  |  |  |  | 29,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash per original principle amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Adjustments to APIC, equity component of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  | 246,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes | 2007 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  | $ 370,000,000 | $ 500,000,000 | $ 1,725,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000
Interest rate |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes | Two Thousand Thirteen Original Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Exceeds percentage of accreted principle amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |
Principal convertible to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Securitization Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,300,000 | $ 1,000,000 |  |  |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |
Term of accounts receivable securitization program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.007 |  |  |  |  |  |  |  |
Securitization Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  | $ 200,000,000 |  |  |  |
Two Thousand And Twelve Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  | 17,900,000 |  |  |  |  |  |  |  |  |  |  |  | 17,900,000 |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (900,000) |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  | 23,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 31.175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Two Thousand Ten Original Notes [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  | $ 46,300,000.0 |  |  | 300,000,000.0 |  |  |  |  |  |  |  |  | $ 46,300,000.0 | 300,000,000.0 |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  | (800,000.0) |  |  | $ (15,500,000.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  | 79,200,000.0 |  |  | $ 543,700,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exceeds percentage of accreted principle amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |
Conversion price of notes (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.03 |  |  |  |  |  |  |  |
Exceeds percentage of conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |
Number of trading days description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | during the five business day period after any five consecutive trading day period |  |  |  |  |  |  |  |
Percentage to compare note price to product of common stock and conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |  |
Principal convertible to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Principle convertible debt put during period |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Two Thousand Ten Original Notes [Member] | Convertible Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |
Two Thousand Ten Original Notes [Member] | Convertible Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Two Thousand Ten Original Notes [Member] | Convertible Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of notes (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Two Thousand And Twelve Notes [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of notes (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31.175 |  |  |  |  |  |  |  |
Two Thousand And Twelve Notes [Member] | Convertible Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 136,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (700,000) |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 171,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of notes (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Two Thousand Thirteen [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of notes (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38.59 |  |  |  |  |  |  |  |
Securitization Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.235% |  |  |  |  |  |  |  |
Convertible Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,000,000 | 50,000,000 | 70,700,000 |  |  |  |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,300,000 | $ 40,000,000 | $ 52,500,000 |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,500,000) |  |  |  |  |  |  |  | $ (5,300,000) |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 2.00% |  |  | 2.00% |  |  |  |  |  |  |  |  | 2.00% | 2.00% |  |  |  |  |  |  |
Convertible Notes Payable [Member] | 2012 and 2013 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes, reacquisition of equity component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,100,000 |  |  |  |  |  |  |  |
Adjustments to APIC, equity component of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,600,000 |  |  |  |  |  |  |  |
Convertible Notes Payable [Member] | Two Thousand Ten Original Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,600,000) |  |  |  |  |  |  |  |
Convertible Notes Payable [Member] | 2010 and 2012 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes, reacquisition of equity component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,200,000 |  |  |  |  |  |  |  |
Adjustments to APIC, equity component of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 122,600,000 |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt obligations |  |  |  |  |  |  |  |  |  | $ 1,190,500,000 |  |  | $ 1,308,200,000 |  |  |  |  |  |  |  |  | 1,190,500,000 | $ 1,308,200,000 |  |  |  |  |  |  |
Term Loan | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit outstanding |  |  |  |  |  |  |  |  |  | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 29, 2020 |  |  |  |  |  |  |  |
Term Loan | Credit Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled principal payments per quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,750,000 |  |  |  |  |  |  |  |
Term Loan | Credit Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled principal payments per quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,500,000 |  |  |  |  |  |  |  |
Revolver | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit outstanding |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 29, 2020 |  |  |  |  |  |  |  |
Amount borrowed under revolver |  |  |  |  | $ 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan A [Member] | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit outstanding |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2017 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit outstanding |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2017 |  |  |  |  |  |  |  |  |
Term Loan B [Member] | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit outstanding |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2019 |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (6,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid principal amount |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2007 Notes [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  |  |  |  |  |  |  |  | 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
November Eighteen Two Thousand Ten Original Notes [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Debt instrument, maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2037 |  |  |  |  |  |  |  |  |  |  |  |
November Eighteen Two Thousand Ten Original Notes [Member] | Convertible Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
February Twenty Nine Two Thousand Twelve Original Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, triggering events |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
February Twenty Nine Two Thousand Twelve Original Notes [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  |  |  |  |  |  |  | 2042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Two Thousand Twelve Original Notes [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Annual yield to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Exceeds percentage of accreted principle amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |
Exceeds percentage of conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |
Number of trading days description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | During the five business day period after any five consecutive trading day period |  |  |  |  |  |  |  |
Percentage to compare note price to product of common stock and conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |  |
Principal convertible to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Two Thousand Twelve Original Notes [Member] | Convertible Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |
Two Thousand Twelve Original Notes [Member] | Convertible Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Due December Two Zero One Seven [Member] | Convertible Notes | Two Thousand Thirteen Original Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual yield to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
Thereafter [Member] | Convertible Notes | Two Thousand Thirteen Original Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual yield to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Two Thousand Thirteen Original Notes [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exceeds percentage of conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |
Number of trading days description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | During the five business day period after any five consecutive trading day period |  |  |  |  |  |  |  |
Percentage to compare note price to product of common stock and conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |  |
Convertible notes, triggering events |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Two Thousand Thirteen Original Notes [Member] | Convertible Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |
Two Thousand Thirteen Original Notes [Member] | Convertible Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
February Fourteen Two Thousand And Thirteen Original Notes [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  |  |  |  |  |  | $ 370,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period |  |  |  |  |  |  | 2043 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | 2010 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,030,000,000 |  |  |
Premium payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,250,000 |  |  |
Subsequent Event | Term Loan | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |
Subsequent Event | Senior Notes | 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes principal amount |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price, percentage of principal amount |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of redemption of senior notes |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price, second period |  | 104.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price, third period |  | 102.188% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price, fourth period |  | 101.094% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of redemption price, fifth period |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage price of principal amount for repurchase of senior note |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
On or After December 15, 2017 [Member] | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date range, start |  |  |  | Dec. 15, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principle amount plus accrued and unpaid interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
December 15, 2017 [Member] | Subsequent Event | Convertible Debt [Member] | 2013 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount Repaid Under Revolver + References No definition available. + Details
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- Definition Represents the rate at which the convertible notes will accrete principal to maturity beginning on either the date that the semi-annual cash coupon payments end, or as applicable, the date of issuance of new convertible notes in an exchange transaction. + References No definition available. + Details
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- Definition In lieu of delivery of shares of the Company's common stock in satisfaction of the Company's obligation upon conversion of the Original Notes and Exchange Notes, the Company may elect to deliver cash or a combination of cash and shares of its common stock. If the Company elects to satisfy its conversion obligation in a combination of cash and shares of the Company's common stock, the Company is required to deliver up to a specified dollar amount of cash per $1,000 original principal amount of Original Notes, and will settle the remainder of its conversion obligation in shares of its common stock. + References No definition available. + Details
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- Definition The convertible notes conversion price into shares of the Company's common stock. + References No definition available. + Details
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- Definition Convertible Notes, Triggering Events 1) During any calendar quarter if the last reported sales price of the Company's common stock exceeds 130% of the conversion price for at least 20 trading days in the 30 consecutive trading days ending on the last trading day of the preceding calendar quarter 2) During the 5 business day period after any five consecutive trading day period in which the trading price per note for each day of such period was less than 98% of the product of the last reported sales price of the Company's common stock and the conversion rate on each such day 3) If the notes have been called for redemption 4) Upon the occurrence of specified corporate events + References No definition available. + Details
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- Definition Maximum percentage of aggregate principal of Senior Notes that can be redeemed with net cash proceeds from certain equity offerings at any time before August 1, 2015. + References No definition available. + Details
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- Definition Debt Instrument Percentage Of Redemption Price if Senior Notes are redeemed by the Company prior to August 1, 2015. + References No definition available. + Details
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- Definition Debt Instrument Percentage Of Redemption Price if Senior Notes are redeemed by the Company beginning August 1, 2018 and thereafter. + References No definition available. + Details
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- Definition Debt Instrument Percentage Of Redemption Price if Senior Notes are redeemed by the Company after August 1, 2017 through July 31, 2018. + References No definition available. + Details
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- Definition Debt Instrument Percentage Of Redemption Price if Senior Notes are redeemed by the Company after August 1, 2015 through July 31, 2016. + References No definition available. + Details
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- Definition The lowest the total net leverage ratio will be under the senior secured credit facilities beginning the quarter ending September 30, 2017. + References No definition available. + Details
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- Definition Percent by which trading price of notes exceeds accreted principal resulting in contingent interest. + References No definition available. + Details
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- Definition The holders of the 2007 Notes, 2010 Notes, 2012 Notes and 2013 Notes may convert the notes into shares of the Company's common stock at a conversion price of approximately $38.59 per share, $23.03 per share, $31.175 and $38.59 per share, respectively, subject to adjustment, prior to the close of business on September 15, 2037 for the 2007 and 2010 Notes, March 1, 2042 for the 2012 Notes and September 15, 2043 for the 2013 Notes upon: during any calendar quarter if the last reported sale price of the Company's common stock exceeds 130% of the conversion price for at least 20 trading days in the 30 consecutive trading days ending on the last trading day of the preceding calendar quarter. + References No definition available. + Details
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- Definition Represents the percentage of the accreted principal amount of the Convertible Notes to be paid as an extension fee penalty in the event of default, as defined, related to the Company's failure to comply with the reporting obligations in the Convertible Notes. + References No definition available. + Details
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- Definition Long term debt obligations without convertible notes. + References No definition available. + Details
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- Definition Number of trading days considered for average closing daily prices description. + References No definition available. + Details
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- Definition The percentage applied to the price of the principal amount of the Senior Notes at which the Company is required to repurchase the Senior Notes in the event there is a change-in-control. + References No definition available. + Details
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- Definition Percent that the trading price per note is less than product of the common stock price and conversion rate, allowing holders to convert notes to common shares. + References No definition available. + Details
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- Definition The conversion rate will not be adjusted for accrued interest or accreted principal in excess of the original $1,000 principal amount. + References No definition available. + Details
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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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