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Goodwill and Other Intangible Assets (Details 3) - USD ($)
$ in Millions
 6 Months Ended 9 Months Ended
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Finite Lived and Indefinite Lived Intangible Assets by Major Class        
Other Intangible Assets, Net   $ 188.9   $ 231.3
Deferred Income Tax Expense (Benefit)   $ (26.8) $ (4.3)  
ADESA Trade Names (Finite)        
Finite Lived and Indefinite Lived Intangible Assets by Major Class        
Other Intangible Assets, Net $ 97.3      
Useful lives 6 years      
ADESA Trade Names (Indefinite)        
Finite Lived and Indefinite Lived Intangible Assets by Major Class        
Other Intangible Assets, Net $ 122.8      
Deferred Income Tax Expense (Benefit) (6.5)      
ADESA tradename - non-cash impairment charge $ 25.5