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Cash and Marketable Securities - Components of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Line Items]        
Cash & Cash Equivalents $ 85.4 $ 69.1 $ 21.8 $ 49.4
Restricted Cash 37.7 35.1    
Restricted Marketable Securities 130.9 126.2    
Total 254.0 230.4    
Cash        
Cash and Cash Equivalents [Line Items]        
Cash & Cash Equivalents 85.4 69.1    
Restricted Cash 37.7 35.1    
Restricted Marketable Securities 0.0 0.0    
Total 123.1 104.2    
Equity securities        
Cash and Cash Equivalents [Line Items]        
Cash & Cash Equivalents 0.0 0.0    
Restricted Cash 0.0 0.0    
Restricted Marketable Securities 130.9 126.2    
Total $ 130.9 $ 126.2