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Cash and Cash Equivalents - Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 0.0 $ 0.5    
Total cash and cash equivalents 704.2 674.7    
Restricted cash included in other assets 0.0 15.0    
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows 704.2 689.7 $ 806.4 $ 922.0
Cash        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 103.7 136.1    
Money market mutual funds        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 547.0 487.3    
Term deposits        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 53.5 $ 50.8