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Financial Instruments and Fair Value Measurements (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
store
Dec. 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment     $ 0 $ 0 $ 318,300,000
Franchise rights impairment     $ 0 $ 0 $ 57,500,000
Franchise rights impairment, number of stores | store 8        
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]         Other Operating Income (Expense), Net
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]     Other Operating Income (Expense), Net Other Operating Income (Expense), Net Other Operating Income (Expense), Net
Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment $ 318,300,000        
Impairment of right-of-use assets     $ 0 $ 100,000 $ 3,100,000
Nonrecurring [Member] | Reporting Unit, Premium Luxury [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment 257,400,000        
Nonrecurring [Member] | Reporting Unit, Collision Centers [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment 41,600,000        
Nonrecurring [Member] | Reporting Unit, Parts Centers [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment 19,300,000        
Nonrecurring [Member] | Other Intangible Assets [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of finite lived intangible assets         2,400,000
Franchise Rights [Member] | Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Franchise rights impairment $ 57,500,000 $ 0 0    
Continuing Operations [Member] | Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of assets held and used     1,600,000 3,100,000 $ 9,200,000
Reported Value Measurement [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Repossessed assets     2,700,000    
Reported Value Measurement [Member] | Continuing Operations [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets held for sale     5,700,000 53,300,000  
Reported Value Measurement [Member] | Discontinued Operations [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets held for sale in discontinued operations     $ 1,100,000 $ 1,100,000