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v3.19.3.a.u2

Convertible Senior Notes - Convertible Senior Notes (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) | Apr. 30, 2018 USD ($) day $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Net proceeds |  |  |  | $ 780,180,000 | $ 335,618,000 | $ 0
Document Period End Date |  |  |  | Dec. 31, 2019 |  |
Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  | $ 700,000,000 |  | $ 800,000,000 |  |
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 |  |  |  |  |
Conversion ratio |  | 0.019396 |  |  |  |
Equity component | 212,000,000.0 |  |  | $ 206,747,000 |  |
Debt issuance costs | $ (19,800,000) |  |  |  |  |
Debt instrument, remaining useful life |  |  |  | 5 years 2 months 12 days |  |
Face value |  |  |  | $ 211,800,000 |  |
Principal |  |  |  | 588,200,000 |  |
Interest rate, effective percentage | 5.40% |  |  |  |  |
Conversion price | $ / shares | $ 51.56 |  |  |  |  |
Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  | $ 345,000,000 | 345,000,000 | 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 |  |  |
Conversion ratio |  |  | 0.037051 |  |  |
Equity component |  |  | $ 64,200,000 | $ 62,444,000 | $ 62,444,000 |
Debt issuance costs |  |  | $ (9,400,000) |  |  |
Debt instrument, remaining useful life |  |  |  | 3 years 4 months 24 days |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 37.91 |  |
Principal |  |  |  | $ 485,300,000 |  |
Value in excess of principal |  |  |  | $ 140,300,000 |  |
Interest rate, effective percentage |  |  | 4.34% |  |  |
Conversion price | $ / shares |  |  | $ 26.95 |  |  |
Sale Price Is Greater Or Equal 130% | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold trading days | day |  |  | 20 |  |  |
Threshold consecutive trading days | day |  |  | 30 |  |  |
Threshold percentage of stock price trigger |  |  | 130.00% |  |  |
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 | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |
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 | 0.125 Percent Convertible Senior Notes Due 2025 | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  | 98.00% |  |  |
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% |  |  |
Liability component | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount | $ 588,000,000.0 |  |  |  |  |
Debt issuance costs | (14,600,000) |  |  |  |  |
Liability component | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount |  |  | $ 280,800,000 |  |  |
Debt issuance costs |  |  | (7,600,000) |  |  |
Equity component | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance costs | (5,300,000) |  |  |  |  |
Equity component | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance costs |  |  | (1,700,000) |  |  |
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 |  |  |
Shares covered by capped call transactions (in shares) | shares |  |  | 12,801,260 |  |  |
Conversion price | $ / shares |  |  | $ 40.68 |  |  |

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