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Stockholders' Equity - Narrative (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 28, 2022 USD ($) alternative | Jun. 30, 2022 USD ($) agreement $ / shares shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2022 USD ($) agreement $ / shares shares | Jun. 30, 2021 USD ($) shares
Restricted stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units, approved (in shares) | shares |  |  |  | 794,013 |
Weighted-average grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 663.94 |
Requisite service period (in years) |  |  |  | 3 years 6 months 3 days |
2020 ATM Program and Equity Forward Amendment |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Sale of stock, equity offering agreement, authorized | $ 1,500.0 |  |  |  |
Number of settlement alternatives | alternative | 3 |  |  |  |
Equity Forward Amendment |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of forward sale agreements | agreement |  | 5 |  | 5 |
Sale of stock, number of shares authorized (in shares) | shares |  | 579,873 |  | 579,873 |
Expected proceeds from sale of stock |  |  |  | $ 394.8 |
Expected issuance of common stock, weighted average price (in dollars per share) | $ / shares |  | $ 680.77 |  | $ 680.77 |
2020 ATM Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Sale of stock, equity offering agreement, available for sale |  | $ 605.2 |  | $ 605.2 |
Issuance of common stock in offering (in shares) | shares |  | 0 | 137,604 | 0 | 137,604
Gross proceeds from sale of stock |  |  | $ 99.6 |  | $ 99.6

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