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Convertible Senior Notes - Convertible Senior Notes (Details) | 1 Months Ended | 12 Months Ended |
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Mar. 31, 2021 USD ($) shares | Aug. 31, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) trading_day | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  | $ 0 | $ 984,096,000 | $ 780,180,000 |
Repayments of convertible senior notes |  |  |  |  | 300,762,000 | 303,967,000 | 0 |
Equity component of 2025/2026 convertible senior notes, net of issuance costs |  |  |  |  |  | 237,462,000 | 206,747,000 |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  | 69,005,000 | 77,095,000 | 0 |
Loss on early extinguishments of debt |  |  |  |  | 78,152,000 | 4,286,000 | $ 0 |
Convertible Senior Notes | 0% Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  | $ 1,000,000,000 |  |  | $ 1,000,000,000 | 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 |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 107.55 |  |  |
Conversion ratio |  | 0.0092978 |  |  |  |  |  |
Convertible Senior Notes | 0% Convertible Senior Notes Due 2026 | Capped Call |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net proceeds |  | $ 103,400,000 |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 156.44 |  |  |
Shares covered by capped call transactions (in shares) | shares |  |  |  |  | 9,297,800 |  |  |
Convertible Senior Notes | 0% Convertible Senior Notes Due 2026, Additional Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  | $ 100,000,000 |  |  |  |  |  |
Convertible Senior Notes | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 699,982,000 | 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 |  |  |  |  |
Repurchased principal amount |  |  |  |  | 100,000,000 |  |  |
Repayments of convertible senior notes | $ 184,900,000 |  |  |  | $ 184,900,000 |  |  |
Carrying amount | 98,300,000 |  |  |  |  |  |  |
Debt extinguished | 100,000,000 |  |  |  |  |  |  |
Derivative liability | 176,500,000 |  |  |  |  |  |  |
Gain (loss) in change in fair value | 8,400,000 |  |  |  |  |  |  |
Loss on early extinguishments of debt | $ (78,200,000) |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 51.56 |  |  |
Conversion ratio |  |  | 0.0193956 |  |  |  |  |
Convertible Senior Notes | 0.125 Percent Convertible Senior Notes Due 2025 | Capped Call |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net proceeds |  |  | $ 97,200,000 |  |  |  |  |
Debt instrument, convertible, shares terminated (in shares) | shares | 1,939,560 |  |  |  |  |  |  |
Proceeds from exercise of convertible senior notes capped call | $ 23,900,000 |  |  |  |  |  |  |
Derivative liability | 22,600,000 |  |  |  |  |  |  |
Gain (loss) in change in fair value | $ 1,300,000 |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 79.32 |  |  |
Shares covered by capped call transactions (in shares) | shares |  |  |  |  | 13,576,571 |  |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 345,000,000 |  | 115,576,000 |  |
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 |  |  |  |  | $ 115,600,000 | 57,400,000 |  |
Aggregate consideration |  |  |  |  | 351,100,000 |  |  |
Repayments of convertible senior notes |  |  |  |  | 115,600,000 | 149,600,000 |  |
Debt conversion, shares issued, value |  |  |  |  | 235,500,000 |  |  |
Carrying amount |  |  |  |  | 114,200,000 |  |  |
Equity component of 2025/2026 convertible senior notes, net of issuance costs |  |  |  |  | $ 236,900,000 |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 26.95 |  |  |
Conversion ratio |  |  |  | 0.0371051 |  |  |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Sale Price Is Greater Or Equal 130% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | trading_day |  |  |  | 20 |  |  |  |
Threshold consecutive trading days | trading_day |  |  |  | 30 |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Trading Price Per $1,000 Principal Amount Less Than 98% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | trading_day |  |  |  | 5 |  |  |  |
Threshold consecutive trading days | trading_day |  |  |  | 10 |  |  |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Trading Price Per $1,000 Principal Amount Less Than 98% | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 98.00% |  |  |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Exchange Of Aggregate Principal Amount |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  |  | 172,000,000 |  |
Repayments of convertible senior notes |  |  |  |  |  | $ 174,600,000 |  |
Debt conversion, shares issued (in shares) | shares |  |  |  |  | 2,983,011 | 4,182,320 |  |
Debt conversion, shares issued, value |  |  |  |  |  | $ 327,100,000 |  |
Carrying amount |  |  |  |  |  | 152,800,000 |  |
Loss on early extinguishments of debt |  |  |  |  |  | 3,300,000 |  |
Aggregate consideration for principal amount exchanged |  |  |  |  |  | 501,700,000 |  |
Convertible senior notes |  |  |  |  |  | 156,100,000 |  |
Debt instrument, equity component |  |  |  |  |  | $ 345,600,000 |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Requests For Conversions |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  | $ 24,700,000 |  |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Election Of Option To Redeem Outstanding Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  | $ 90,900,000 |  |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Capped Call |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, convertible, shares terminated (in shares) | shares |  |  |  |  | 4,288,459 | 6,380,815 |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  | $ 45,200,000 | $ 57,400,000 |  |
Convertible Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Extinguishment Of Aggregate Principal Amount |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchased principal amount |  |  |  |  |  | 57,400,000 |  |
Carrying amount |  |  |  |  |  | $ 51,600,000 |  |
Debt instrument, convertible, shares terminated (in shares) | shares |  |  |  |  |  | 2,131,354 |  |
Proceeds from exercise of convertible senior notes capped call |  |  |  |  |  | $ 19,700,000 |  |
Loss on early extinguishments of debt |  |  |  |  |  | 1,000,000 |  |
Aggregate consideration for principal amount exchanged |  |  |  |  |  | 149,600,000 |  |
Convertible senior notes |  |  |  |  |  | 52,600,000 |  |
Debt instrument, equity component |  |  |  |  |  | $ 97,000,000 |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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