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Financial Instruments and Fair Value Measurements - Fair Values of Financial Instruments Not Measured at Fair Value in Consolidated Balance Sheets (Details) - Senior Notes - USD ($) $ in Millions | Jun. 30, 2025 | Jun. 27, 2025 | Dec. 31, 2024
--- | --- | --- | ---
10.625% senior secured notes due January 15, 2031 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate (in percent) | 10.625% |  |
Long-term debt, carrying value | $ 685.9 |  | $ 0.0
6.875% senior secured notes due November 1, 2027 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate (in percent) | 6.875% |  |
Long-term debt, carrying value | $ 0.0 | $ 4.9 | 481.6
Fair Value | 10.625% senior secured notes due January 15, 2031 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-term debt, fair value | 719.9 |  | 0.0
Fair Value | 6.875% senior secured notes due November 1, 2027 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-term debt, fair value | $ 0.0 |  | $ 471.3

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