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Cash and Marketable Securities - Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 35.1 $ 31.6
Affiliate cash    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 17.7 12.9
Self-insured captive funds    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 17.1 17.3
Other    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 0.3 $ 1.4