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Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 228.4 $ 194.5    
Restricted cash 41.0 50.0    
Total cash, cash equivalents, and restricted cash 269.4 244.5 $ 392.9 $ 818.7
Cash        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 69.8 65.7    
Money market funds        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 148.7 87.1    
Commercial paper        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 0.0 26.8    
U.S. government and agencies        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 9.9 14.9    
Fiduciary assets        
Cash and Cash Equivalents [Line Items]        
Restricted cash 32.4 30.6    
Letters of credit and cash on deposit        
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 8.6 $ 19.4