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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Income Tax Disclosure [Abstract]          
Income tax expense $ 56.6 $ 55.3 $ 164.8 $ 145.8  
Effective income tax rate (as a percent) 23.80% 22.90% 23.40% 24.20%  
Income tax expense (benefits), tax credit, discrete benefits charges $ (1.5) $ (1.0) $ (5.7) $ 3.2  
Income tax expense (benefits) tax credit discrete items release of reserves (0.7)        
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)    
Unrecognized tax benefits 64.7   64.7   $ 64.3
Net unrecognized tax benefits, excluding interest and penalties that would affect the company's net income if recognized 51.0   51.0    
Interest and penalties expense on unrecognized tax benefits     3.0 1.8  
Accruals for payment of interest and penalties 10.8   10.8    
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit $ 23.2   23.2    
Cash paid for income taxes, net of refunds     364.9 122.6  
Cash paid for purchase of transferable tax credits     $ 65.4 $ 5.3