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Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents $ 142.1 $ 194.5  
Restricted cash 53.0 50.0  
Total cash, cash equivalents, and restricted cash 195.1 244.5 $ 818.7
Cash      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 54.3 65.7  
Money market funds      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 77.8 87.1  
Commercial paper      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 10.0 26.8  
U.S. government and agencies      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 0.0 14.9  
Fiduciary assets      
Cash and Cash Equivalents [Line Items]      
Restricted cash 32.5 30.6  
Letters of credit and cash on deposit      
Cash and Cash Equivalents [Line Items]      
Restricted cash $ 20.5 $ 19.4