Annual report [Section 13 and 15(d), not S-K Item 405]

Income Taxes - Summary of Actual Income Tax Expense (Benefit) Differed From the Amount Computed by Applying the Statutory Federal Income Tax Rate to Income (Loss) Before Income Taxes (Details)

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Income Taxes - Summary of Actual Income Tax Expense (Benefit) Differed From the Amount Computed by Applying the Statutory Federal Income Tax Rate to Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 04, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]        
Income (loss) before income taxes   $ (368.4) $ (214.8) $ (58.0)
Statutory rate 100.00% 21.00% 21.00% 21.00%
Federal income tax expense (benefit) at statutory rate   $ (77.4) $ (45.1) $ (12.2)
State taxes, net of federal benefit   0.4 (0.8) 0.8
Foreign tax effects   0.3    
Domestic Federal Reconciling Items        
Effect of Cross-Border Tax Laws   0.1    
Permanent items/ Nontaxable or nondeductible items   0.7 3.4 7.2
Other     3.6 (1.3)
Other adjustments        
Transactions with related parties   25.2    
Other items   0.2    
Non-controlling interest       (10.7)
Business combination adjustment       (8.3)
Changes in valuation Allowance   37.6 31.9 25.7
Income tax expense (benefit)   $ (12.9) $ (7.0) $ 1.2
State taxes, net of federal benefit   (0.10%)    
Foreign tax effects   (0.10%)    
Domestic Federal Reconciling Items        
Effect of Cross-Border Tax Laws   0.00%    
Changes in valuation allowance   (10.20%)    
Nontaxable or nondeductible items   (0.20%)    
Other adjustments        
Transactions with related parties   (6.80%)    
Other items   (0.10%)    
Income tax expense (benefit)   3.50% 3.30% (2.10%)