v3.26.3
Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Income Tax Disclosure [Line Items]          
Income tax expense $ 40.5 $ 41.7 $ 88.2 $ 143.7  
Effective income tax rate (as a percent) 22.80% 17.50% 19.50% 21.80%  
Income tax expense (benefits), tax credit, discrete benefits charges $ 0.7 $ (21.5) $ (17.9) $ (20.1)  
Charge related to the recapture of a purchased federal income tax credit 5.4   5.4    
Benefit related to expiration of statute of limitations anti-hybrid tax matter 4.0   20.7    
Income tax expense (benefits) tax credit discrete items resolution of federal income tax audit   $ (19.1)   (19.1)  
Unrecognized tax benefits 29.4   29.4   $ 45.5
Net unrecognized tax benefits, excluding interest and penalties that would affect the company's net income if recognized 18.8   18.8    
Interest and penalties expense (income) on unrecognized tax benefits     (1.6) (4.1)  
Accruals for payment of interest and penalties $ 7.0   7.0    
Cash paid for purchase of transferable tax credits     $ 35.4 $ 9.7