v3.26.1
Income Taxes - Summary of Tax Credit Carryforwards (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Income Taxes Disclosure [Line Items]    
Net operating loss carryover $ 459.3 $ 452.4
Tax credit carryover 121.2 100.5
Capital loss carryover 123.7 $ 7.4
Net operating loss carryover valuation allowance 391.0  
Tax credit carryover valuation allowance 47.8  
Capital loss carryover valuation allowance 123.7  
1-5 Years [Member]    
Income Taxes Disclosure [Line Items]    
Net operating loss carryover 24.2  
Tax credit carryover 29.0  
Capital loss carryover 115.3  
6-10 Years [Member]    
Income Taxes Disclosure [Line Items]    
Net operating loss carryover 231.9  
Tax credit carryover 78.8  
11+ Years [Member]    
Income Taxes Disclosure [Line Items]    
Net operating loss carryover 39.5  
Tax credit carryover 12.2  
Capital loss carryover 0.6  
Indefinite [Member]    
Income Taxes Disclosure [Line Items]    
Net operating loss carryover 163.7  
Tax credit carryover 1.2  
Capital loss carryover $ 7.8