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Equity Method Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 605.9 $ 494.0  
Income (loss) from equity method investments (2.1) (22.9) $ 15.0
Hagerty [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 237.4 $ 245.1  
Equity method investment, ownership percentage 23.00% 23.00%  
Equity method investment, quoted market value $ 608.4 $ 656.0