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Summary of Significant Accounting Policies - Summary of Changes to Presentation of Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Cash and cash equivalents $ 857.6 $ 738.4 $ 629.8
Restricted cash 169.9   180.8
Fiduciary assets current 30,704.7 18,236.7  
Accounts receivable, net 3,769.3 2,911.1  
Other current assets 436.2 399.0  
Total current assets 35,937.7 22,285.2  
Total assets 53,203.9 38,358.4 $ 38,517.2
Fiduciary liabilities current 30,704.7 18,236.7  
Accrued compensation and other current liabilities   2,003.3  
Total current liabilities 34,473.9 21,338.6  
Total liabilities 42,693.9 29,168.2  
Total liabilities and stockholders' equity $ 53,203.9 38,358.4  
Reported 2022      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Cash and cash equivalents   342.3  
Restricted cash   4,621.9  
Premiums and fees receivable   16,408.9  
Other current assets   1,461.5  
Total current assets   22,834.6  
Total assets   38,907.8  
Premiums payable to underwriting enterprises   18,698.2  
Accrued compensation and other current liabilities   2,091.2  
Total current liabilities   21,888.0  
Total liabilities   29,717.6  
Total liabilities and stockholders' equity   38,907.8  
Change      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Cash and cash equivalents   396.1  
Restricted cash   (4,621.9)  
Premiums and fees receivable   (16,408.9)  
Fiduciary assets current   18,236.7  
Accounts receivable, net   2,911.1  
Other current assets   (1,062.5)  
Total current assets   (549.4)  
Total assets   (549.4)  
Premiums payable to underwriting enterprises   (18,698.2)  
Fiduciary liabilities current   18,236.7  
Accrued compensation and other current liabilities   (87.9)  
Total current liabilities   (549.4)  
Total liabilities   (549.4)  
Total liabilities and stockholders' equity   $ (549.4)