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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Income Tax Disclosure [Line Items]          
Income tax expense $ 41.7 $ 56.6 $ 143.7 $ 164.8  
Effective income tax rate (as a percent) 17.50% 23.80% 21.80% 23.40%  
Income tax expense (benefits), tax credit, discrete benefits charges $ (21.5) $ (1.5) $ (20.1) $ (5.7)  
Income tax benefit, tax credit, discrete items purchase of discounted federal tax credits       (3.2)  
Income tax benefits, tax credit, discrete items amended return interest income       (1.1)  
Income tax expense (benefits) tax credit discrete items release of reserves   $ (0.7)      
Income tax expense (benefits) tax credit discrete items resolution of federal income tax audit (19.1)   (19.1)    
Unrecognized tax benefits 46.2   46.2   $ 61.6
Net unrecognized tax benefits, excluding interest and penalties that would affect the company's net income if recognized 35.9   35.9    
Interest and penalties expense (income) on unrecognized tax benefits     (4.1) 3.0  
Accruals for payment of interest and penalties 7.7   7.7    
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit $ 18.2   18.2    
Cash paid for purchase of transferable tax credits     $ 9.7 $ 65.4