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Convertible Senior Notes - Convertible Senior Notes (Details) | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) day | Feb. 22, 2021 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  | $ 984,096,000 | $ 780,180,000 | $ 335,618,000 |
Repayments of convertible senior notes |  |  |  |  | 303,967,000 | 0 | 0 |
Loss on early extinguishments of debt |  |  |  |  | 4,286,000 | 0 | 0 |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  | $ 77,095,000 | 0 | $ 0 |
0.25% Convertible Senior Notes Due 2023 | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount requests for conversion |  |  |  | $ 24,700,000 |  |  |  |
Shares related to convertible senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  | $ 90.33 |  |  |
Shares related to convertible senior notes | 0% Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount | $ 1,000,000,000.0 |  |  |  | $ 1,000,000,000 |  |  |
Interest rate, stated percentage | 0.00% |  |  |  |  |  |  |
Principal amount | $ 1,000,000,000 |  |  |  |  |  |  |
Less initial purchasers’ discount | (15,000,000) |  |  |  |  |  |  |
Less other issuance costs | (904,000) |  |  |  |  |  |  |
Net proceeds | 984,096,000 |  |  |  |  |  |  |
Debt instrument, equity component | 241,300,000 |  |  |  | 237,462,000 |  |  |
Unamortized issuance costs | $ (15,900,000) |  |  |  | $ (11,338,000) |  |  |
Conversion ratio | 0.0092978 |  |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  | $ 107.55 |  |  |
Debt instrument, remaining useful life |  |  |  |  | 5 years 8 months 12 days |  |  |
Debt conversion, converted instrument, amount |  |  |  |  | $ 839,900,000 |  |  |
Debt instrument, if-converted value less than principal |  |  |  |  | (160,100,000) |  |  |
Interest rate, effective percentage | 4.63% |  |  |  |  |  |  |
Shares related to convertible senior notes | 0% Convertible Senior Notes Due 2026 | Debt Instrument, Liability Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying amount | $ 758,700,000 |  |  |  |  |  |  |
Unamortized issuance costs | (12,100,000) |  |  |  |  |  |  |
Shares related to convertible senior notes | 0% Convertible Senior Notes Due 2026 | Debt Instrument, Equity Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized issuance costs | (3,800,000) |  |  |  |  |  |  |
Shares related to convertible senior notes | 0% Convertible Senior Notes Due 2026, Additional Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount | 100,000,000 |  |  |  |  |  |  |
Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  | 800,000,000 | 800,000,000 |  | $ 700,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  | 0.125%
Option to purchase additional notes |  | $ 100,000,000 |  |  |  |  |  |
Principal amount |  | 800,000,000 |  |  |  |  |  |
Less initial purchasers’ discount |  | (18,998,000) |  |  |  |  |  |
Less other issuance costs |  | (822,000) |  |  |  |  |  |
Net proceeds |  | 780,180,000 |  |  |  |  |  |
Debt instrument, equity component |  | 212,000,000.0 |  |  | 206,747,000 | 206,747,000 |  |
Unamortized issuance costs |  | $ (19,800,000) |  |  | $ (10,248,000) | (12,691,000) |  |
Conversion ratio |  | 0.0193956 |  |  |  |  |  |
Conversion price | $ / shares |  |  |  |  | $ 51.56 |  |  |
Debt instrument, remaining useful life |  |  |  |  | 4 years 2 months 12 days |  |  |
Debt conversion, converted instrument, amount |  |  |  |  | $ 1,401,600,000 |  |  |
Debt instrument, if-converted value in excess of principal |  |  |  |  | 601,600,000 |  |  |
Interest rate, effective percentage |  | 5.40% |  |  |  |  |  |
Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 | Debt Instrument, Liability Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying amount |  | $ 588,000,000.0 |  |  |  |  |  |
Unamortized issuance costs |  | (14,600,000) |  |  |  |  |  |
Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 | Debt Instrument, Equity Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized issuance costs |  | (5,300,000) |  |  |  |  |  |
Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  | $ 345,000,000 |  | 115,576,000 | 345,000,000 |  |
Interest rate, stated percentage |  |  | 0.25% |  |  |  |  |
Option to purchase additional notes |  |  | $ 45,000,000 |  |  |  |  |
Principal amount |  |  | 345,000,000 |  |  |  |  |
Less initial purchasers’ discount |  |  | (8,625,000) |  |  |  |  |
Less other issuance costs |  |  | (757,000) |  |  |  |  |
Net proceeds |  |  | 335,618,000 |  |  |  |  |
Repurchased principal amount |  |  |  |  | 57,400,000 |  |  |
Repayments of convertible senior notes |  |  |  |  | 149,600,000 |  |  |
Carrying amount |  |  |  |  | 115,600,000 |  |  |
Debt instrument, equity component |  |  | 64,200,000 |  | 20,919,000 | 62,444,000 |  |
Unamortized issuance costs |  |  | $ (9,400,000) |  | $ (1,245,000) | $ (5,028,000) |  |
Conversion ratio |  |  | 0.0371051 |  |  |  |  |
Conversion price | $ / shares |  |  |  |  | $ 26.95 |  |  |
Debt instrument, remaining useful life |  |  |  |  | 2 years 4 months 24 days |  |  |
Debt conversion, converted instrument, amount |  |  |  |  | $ 387,400,000 |  |  |
Debt instrument, if-converted value in excess of principal |  |  |  |  | 271,800,000 |  |  |
Interest rate, effective percentage |  |  | 4.34% |  |  |  |  |
Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 | Debt Instrument, Liability Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying amount |  |  | $ 280,800,000 |  |  |  |  |
Unamortized issuance costs |  |  | (7,600,000) |  |  |  |  |
Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 | Debt Instrument, Equity Component |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized issuance costs |  |  | $ (1,700,000) |  |  |  |  |
Sale Price Is Greater Or Equal 130% | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | day |  |  | 20 |  |  |  |  |
Threshold consecutive trading days | day |  |  | 30 |  |  |  |  |
Threshold percentage of stock price trigger |  |  | 130.00% |  |  |  |  |
Trading Price Per $1,000 Principal Amount Less Than 98% | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | day |  |  | 5 |  |  |  |  |
Threshold consecutive trading days | day |  |  | 10 |  |  |  |  |
Trading Price Per $1,000 Principal Amount Less Than 98% | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  | 98.00% |  |  |  |  |
Exchange Of Aggregate Principal Amount | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  | 172,000,000.0 |  |  |
Aggregate consideration for principal amount exchanged |  |  |  |  | 501,700,000 |  |  |
Repayments of convertible senior notes |  |  |  |  | $ 174,600,000 |  |  |
Debt conversion, shares issued (in shares) | shares |  |  |  |  | 4,182,320 |  |  |
Debt conversion, shares issued, value |  |  |  |  | $ 327,100,000 |  |  |
Convertible senior notes |  |  |  |  | 156,100,000 |  |  |
Carrying amount |  |  |  |  | 152,800,000 |  |  |
Debt instrument, equity component |  |  |  |  | 345,600,000 |  |  |
Loss on early extinguishments of debt |  |  |  |  | 3,300,000 |  |  |
Extinguishment Of Aggregate Principal Amount | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  | 57,400,000 |  |  |
Aggregate consideration for principal amount exchanged |  |  |  |  | 149,600,000 |  |  |
Convertible senior notes |  |  |  |  | 52,600,000 |  |  |
Carrying amount |  |  |  |  | 51,600,000 |  |  |
Debt instrument, equity component |  |  |  |  | 97,000,000.0 |  |  |
Loss on early extinguishments of debt |  |  |  |  | $ 1,000,000.0 |  |  |
Debt instrument, convertible, shares terminated (in shares) | shares |  |  |  |  | 2,131,354 |  |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  | $ 19,700,000 |  |  |
Capped Call | Shares related to convertible senior notes | 0% Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net proceeds | $ 103,400,000 |  |  |  |  |  |  |
Shares covered by capped call transactions (in shares) | shares |  |  |  |  | 9,297,800 |  |  |
Conversion price | $ / shares |  |  |  |  | $ 156.44 |  |  |
Capped Call | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net proceeds |  | $ 97,200,000 |  |  |  |  |  |
Shares covered by capped call transactions (in shares) | shares |  |  |  |  | 15,516,480 |  |  |
Conversion price | $ / shares |  |  |  |  | $ 79.32 |  |  |
Capped Call | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net proceeds |  |  | $ 39,200,000 |  |  |  |  |
Debt instrument, convertible, shares terminated (in shares) | shares |  |  |  |  | 6,380,815 |  |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  | $ 57,400,000 |  |  |
Shares covered by capped call transactions (in shares) | shares |  |  |  |  | 4,288,459 |  |  |
Conversion price | $ / shares |  |  |  |  | $ 40.68 |  |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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