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Long-Term Debt - Convertible Senior Notes due 2024 - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 15, 2024 USD ($) $ / shares | Aug. 31, 2023 USD ($) | Mar. 31, 2018 USD ($) $ / shares | Mar. 31, 2024 | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 01, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  | $ 2,332.7 |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  | 7.6 | $ 7.1 | $ 6.3 |
Long-term debt |  |  |  |  |  |  |  | 2,260.1 | 2,562.4 |  |
Paid-in capital in excess of par value |  |  |  |  |  |  |  | 278.2 | 233.9 |  |
Retained earnings (accumulated deficit) |  |  |  |  |  |  |  | (808.0) | (1,062.3) |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  | (10.5) | 1.0 | 12.8 |
Accrued interest on debt |  |  |  |  |  |  |  | 194.4 | 159.1 | 133.5 |
Interest expense |  |  |  |  |  |  |  | $ 218.3 | 165.9 | 139.3 |
Two Point Six Two Five Percentage Convertible Senior Notes Due Two Thousand Twenty Four [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of senior notes issued |  | $ 65.5 | $ 550.0 |  |  | $ 277.5 |  |  |  | 277.5 |
Convertible notes, interest rate |  |  | 2.625% |  |  |  |  | 2.625% |  |  |
Line of credit maturity |  |  | Mar. 15, 2024 | 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 |  |  |  |  |  |  |  |
Outstanding principal amount |  |  | $ 550.0 |  |  |  |  |  | 197.0 |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  | 0.2 | 1.0 | 2.1 |
Non-cash interest expense |  |  |  |  |  |  | $ 0.0 |  |  |  |
Long-term debt |  |  | 410.1 |  |  |  |  |  |  |  | $ 59.1
Paid-in capital in excess of par value |  |  | $ 139.9 |  |  |  |  |  |  |  |
Effective interest rate on convertible notes |  |  | 8.40% |  |  |  |  |  |  |  | 3.10%
Deferred financing costs |  |  | $ 12.9 |  |  |  |  |  |  |  |
Deferred financing costs recorded as additional paid-in-capital in excess of par value |  |  | 3.3 |  |  |  |  |  |  |  |
Additional Paid in Capital |  |  |  |  |  |  |  |  |  |  | $ 136.7
Repurchase of convertible notes |  |  |  |  |  |  |  |  |  | 287.5 |
Debt instrument , Purchase Price |  | 65.1 |  |  |  |  |  |  |  | 274.9 |
Accrued interest |  | 0.8 |  |  |  | 1.7 |  |  |  | 1.7 |
Reduction to long term debt representing carrying value of convertible debt | $ 197.0 | $ 65.3 |  |  |  |  |  |  |  | 286.0 |
Gain on extinguishment of debt |  |  |  |  | $ 1.0 | $ 12.8 |  |  |  |  |
Repayment of debt | 197.0 |  |  |  |  |  |  |  |  |  |
Accrued interest on debt | $ 2.6 |  |  |  |  |  |  |  |  |  |
Unamortized debt discount and debt issuance costs |  |  |  |  |  |  |  |  | 0.2 |  |
Convertible senior notes, carrying value |  |  |  |  |  |  |  | 0.0 | 196.8 |  |
Fair value of notes |  |  |  |  |  |  |  |  | 196.2 |  |
Interest expense |  |  |  |  |  |  |  | $ 1.2 | $ 7.2 | $ 16.3 |
Two Point Six Two Five Percentage Convertible Senior Notes Due Two Thousand Twenty Four [Member] | Debt Issuance Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  | $ 9.6 |  |  |  |  |  |  |  |
Accounting Standards Update 2020-06 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  |  |  |  |  |  |  | $ 77.6

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