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Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 140.9 $ 197.6    
Restricted cash 39.3 35.2    
Total cash, cash equivalents, and restricted cash 180.2 232.8 $ 263.3 $ 195.1
Cash        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 55.5 99.6    
Money market funds        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 83.9 94.4    
Commercial paper        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 0.0 2.8    
U.S. government and agencies        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 1.5 0.8    
Fiduciary assets        
Cash and Cash Equivalents [Line Items]        
Restricted cash 28.8 25.0    
Letters of credit and cash on deposit        
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 10.5 $ 10.2