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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
store
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain/(loss) on goodwill $ (318.3) $ 0.0  
Goodwill impairment $ 318.3 0.0  
Franchise rights impairment, number of stores | store 8    
Franchise rights impairment $ 57.5 0.0  
Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain/(loss) on goodwill (318.3) 0.0  
Gain/(Loss) on franchise rights and other (59.9) 0.0  
Gain/(Loss) on right-of-use assets (0.4) (0.2)  
Gain/(Loss) on assets held and used (5.7) 0.0  
Goodwill impairment 318.3 0.0  
Impairment of intangible assets 59.9 0.0  
Impairment of long-lived assets held and used 5.7 0.0  
Impairment charges related to right-of-use assets 0.4 0.2  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill 457.5 0.0  
Franchise rights and other 26.2 0.0  
Right-of-use assets 1.4 0.1  
Long-lived assets held and used 1.8 $ 0.0  
Reported Value Measurement [Member] | Continuing Operations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets held for sale 36.7   $ 40.6
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 8.0   $ 8.0
Franchise Rights [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights impairment 57.5    
Reporting Unit, Premium Luxury [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain/(loss) on goodwill (257.4)    
Goodwill impairment 257.4    
Reporting Unit, Collision Centers [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain/(loss) on goodwill (41.6)    
Goodwill impairment 41.6    
Reporting Unit, Parts Centers [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain/(loss) on goodwill (19.3)    
Goodwill impairment 19.3    
Other Intangible Assets [Member] | Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain/(Loss) on franchise rights and other (2.4)    
Impairment of intangible assets 2.4    
Valuation Technique, Discounted Cash Flow [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights and other $ 24.6    
Valuation Technique, Discounted Cash Flow [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.020    
Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Weighted Average Cost of Capital [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.077    
Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.111    
Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Long-term Pretax Income Margin [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.006    
Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Contributory Asset Charges [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.042    
Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Weighted Average Cost of Capital [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.086    
Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.143    
Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Long-term Pretax Income Margin [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.028    
Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Contributory Asset Charges [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.121    
Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Weighted Average Cost of Capital [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.084    
Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.121    
Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Long-term Pretax Income Margin [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.014    
Valuation Technique, Discounted Cash Flow [Member] | Weighted Average [Member] | Franchise Rights [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Contributory Asset Charges [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Franchise rights, measurement input 0.062