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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	Sep. 30, 2025	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%	10.625%
Long-term debt, carrying value	$ 686.6			$ 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%	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	745.1			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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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