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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
store
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Gain/(Loss) on goodwill $ 0.0   $ 0.0 $ (318.3) $ 0.0  
Goodwill impairment 0.0   0.0 318.3 0.0  
Franchise rights impairment, number of stores | store   8        
Franchise rights impairment 0.0   9.6 57.5 9.6  
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) (9.6)  
Gain/(Loss) on right-of-use assets       (0.4) (0.2)  
Gain/(Loss) on assets held and used       (5.8) 0.0  
Goodwill impairment   318.3     0.0  
Impairment of intangible assets       59.9 9.6  
Impairment of long-lived assets held and used       5.8 0.0  
Impairment of 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   0.0 457.5 0.0  
Franchise rights and other 26.2   8.9 26.2 8.9  
Right-of-use assets 1.4   0.1 1.4 0.1  
Long-lived assets held and used 1.8   0.0 1.8 0.0  
Continuing Operations [Member] | Fair Value, Nonrecurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Gain/(Loss) on assets held for sale       0.0 (1.1)  
Impairment of assets held for sale       0.0 1.1  
Continuing Operations [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-lived assets held for sale in continuing operations 0.0   $ 21.3 0.0 21.3  
Reported Value Measurement [Member] | Continuing Operations [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets held for sale 37.6     37.6   $ 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   $ 8.0
Franchise Rights [Member] | Fair Value, Nonrecurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Franchise rights impairment $ 0.0 57.5     $ 9.6  
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, Premium Luxury [Member] | Fair Value, Nonrecurring [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, Collision Centers [Member] | Fair Value, Nonrecurring [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    
Reporting Unit, Parts Centers [Member] | Fair Value, Nonrecurring [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, 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, 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   0.085        
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