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v3.25.3

Long-Term Debt - Convertible Senior Notes due 2024 - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 15, 2024 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Mar. 31, 2024 | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Aug. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  | $ 2,079.1 |  |  | $ 2,079.1 |  |  |  |
Long-term debt |  |  | 2,017.9 |  |  | 2,017.9 |  | $ 2,260.1 |  |
Paid-in capital in excess of par value |  |  | 304.6 |  |  | 304.6 |  | 278.2 |  |
Retained earnings (accumulated deficit) |  |  | (665.1) |  |  | (665.1) |  | $ (808.0) |  |
Interest expense |  |  | $ 53.0 | $ 59.4 |  | $ 163.0 | $ 161.4 |  |  |
2.625% Convertible Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of senior notes issued |  | $ 550.0 |  |  |  |  |  |  | $ 65.5 | $ 287.5
Convertible notes, interest rate |  | 2.625% |  |  |  |  |  |  |  |
Line of credit maturity |  | Mar. 15, 2024 |  |  | Mar. 15, 2024 |  |  |  |  |
Convertible notes, conversion feature |  |  |  |  |  | On and after December 15, 2023, holders could convert their 2024 Convertible Notes at any time, regardless of the circumstances. In December 2021, the Company made an irrevocable election under the indenture governing the 2024 Convertible Notes to require the principal portion of the 2024 Convertible Notes to be settled in cash and any excess in shares or cash. |  |  |  |
Principal amount of convertible notes | $ 1,000.0 |  |  |  |  | $ 1,000.0 |  |  |  |
Convertible notes conversion rate | 16.0467 | 16.0056 |  |  |  |  |  |  |  |
Convertible notes conversion price | $ / shares | $ 62.32 | $ 62.48 |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  | 0.2 |  |  |
Repayment of debt | $ 197.0 |  |  |  |  |  |  |  |  |
Accrued interest on debt | $ 2.6 |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | $ 1.2 |  |  |

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