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Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 491.8   $ 494.0
Income (loss) from equity method investments (1.5) $ (23.2)  
Hagerty, Inc. [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 236.6   $ 245.1
Equity method investment, ownership percentage 23.00%   23.00%
Equity method investment, quoted market value $ 681.7   $ 656.0