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v3.20.1

Convertible Senior Notes (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) | Apr. 30, 2018 USD ($) day $ / shares shares | Mar. 31, 2020 USD ($) $ / shares | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Net proceeds |  |  |  | $ 0 | $ 682,594,000 |
Senior Notes | 0.125% Convertible Senior Notes Due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face value | $ 100,000,000 | $ 700,000,000 |  | $ 800,000,000 | $ 700,000,000 | $ 800,000,000
Interest rate, stated percentage |  | 0.125% |  |  | 0.125% |
Proceeds from issuance of debt | 800,000,000 |  |  |  |  |
Less initial purchasers’ discount | (18,998,000) |  |  |  |  |
Less other issuance costs | (822,000) |  |  |  |  |
Net proceeds | $ 780,180,000 |  |  |  |  |
Conversion price | $ / shares | $ 51.56 |  |  |  |  |
Debt instrument, remaining useful life |  |  |  | 5 years |  |
Debt conversion, converted instrument, amount |  |  |  | $ 555,200,000 |  |
Debt instrument, if-converted value less than principal |  |  |  | 244,800,000 |  |
Interest rate, effective percentage | 5.40% |  |  |  |  |
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Capped Call |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net proceeds | $ 97,200,000 |  |  |  |  |
Conversion price | $ / shares | $ 79.32 |  |  |  |  |
Debt instrument, convertible (in shares) | shares | 15,516,480 |  |  |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face value |  |  | $ 345,000,000 | $ 345,000,000 |  | $ 345,000,000
Interest rate, stated percentage |  |  | 0.25% |  |  |
Proceeds from issuance of debt |  |  | $ 345,000,000 |  |  |
Less initial purchasers’ discount |  |  | (8,625,000) |  |  |
Less other issuance costs |  |  | (757,000) |  |  |
Net proceeds |  |  | 335,618,000 |  |  |
Option to purchase additional notes |  |  | $ 45,000,000 |  |  |
Conversion ratio |  | 0.0193956 | 0.0371051 |  |  |
Conversion price | $ / shares |  |  | $ 26.95 |  |  |
Debt instrument, remaining useful life |  |  |  | 3 years 1 month 6 days |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 35.78 |  |
Debt conversion, converted instrument, amount |  |  |  | $ 458,000,000.0 |  |
Debt instrument, if-converted value in excess of principal |  |  |  | $ 113,000,000.0 |  |
Interest rate, effective percentage |  |  | 4.34% |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Sale Price Is Greater Or Equal 130% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold trading days | day |  |  | 20 |  |  |
Threshold consecutive trading days | day |  |  | 30 |  |  |
Threshold percentage of stock price trigger |  |  | 130.00% |  |  |
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 | day |  |  | 5 |  |  |
Threshold consecutive trading days | day |  |  | 10 |  |  |
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% |  |  |
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Capped Call |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net proceeds |  |  | $ 39,200,000 |  |  |
Conversion price | $ / shares |  |  | $ 40.68 |  |  |
Debt instrument, convertible (in shares) | shares |  |  | 12,801,260 |  |  |

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