v3.26.1
Financial Instruments and Fair Value Measurements (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
store
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Feb. 28, 2026
USD ($)
Dec. 31, 2025
USD ($)
Apr. 30, 2025
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity investments with readily determinable fair values   $ 1,100,000   $ 1,100,000     $ 12,800,000  
Net gains (losses) recognized during the period on equity securities       54,000,000.0 $ (9,800,000)      
Less: Net gains recognized during the period on equity securities sold/exchanged during the period       1,500,000 0      
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date       52,500,000 (9,800,000)      
Goodwill impairment   0 $ 65,300,000 0 65,300,000      
Franchise rights impairment, number of stores | store     9          
Franchise rights impairment   0 $ 71,700,000 0 71,700,000      
Fair Holdings, Inc. [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair value of new equity investment $ 26,000,000.0              
Gain on new equity investment $ 6,300,000              
Fair Value, Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity investment without readily determinable fair value, cumulative downward adjustment   8,400,000   8,400,000        
Equity investment without readily determinable fair value, cumulative upward adjustment   49,600,000   49,600,000        
Goodwill impairment       0 65,300,000      
Impairment of assets held and used       9,300,000 3,200,000      
Fair Value, Nonrecurring | AN Reportable Segment, Domestic                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Impairment of assets held and used   2,900,000   2,900,000        
Fair Value, Nonrecurring | AN Reportable Segment, Premium Luxury                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Impairment of assets held and used   200,000   200,000        
Fair Value, Nonrecurring | Corporate and other                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Impairment of assets held and used   6,200,000   6,200,000        
Fair Value, Nonrecurring | Waymo LLC [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity investments without readily determinable fair value, upward price adjustment       46,200,000        
Fair Value, Nonrecurring | Reporting Unit, Mobile Service                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Goodwill impairment     65,300,000 0        
Franchise Rights                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Franchise rights impairment       0        
Franchise Rights | Fair Value, Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Franchise rights impairment     71,700,000 0 71,700,000      
Franchise Rights | Fair Value, Nonrecurring | Level 3                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise rights   0 $ 42,700,000 0 $ 42,700,000      
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise rights               $ 42,700,000
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Long-Term Revenue Growth Rate                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.020
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Minimum | Measurement Input, Weighted Average Cost of Capital [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.089
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Minimum | Measurement Input, Discount Rate                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.096
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Minimum | Measurement Input, Long-term Pretax Loss Margin [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.000
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Minimum | Measurement Input, Contributory Asset Charges [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.051
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Maximum | Measurement Input, Weighted Average Cost of Capital [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.091
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Maximum | Measurement Input, Discount Rate                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.113
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Maximum | Measurement Input, Long-term Pretax Loss Margin [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.059
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Maximum | Measurement Input, Contributory Asset Charges [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.084
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Arithmetic Average | Measurement Input, Weighted Average Cost of Capital [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.090
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Arithmetic Average | Measurement Input, Discount Rate                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.104
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Arithmetic Average | Measurement Input, Long-term Pretax Loss Margin [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.024
Franchise Rights | Fair Value, Nonrecurring | Level 3 | Valuation Technique, Discounted Cash Flow [Member] | Arithmetic Average | Measurement Input, Contributory Asset Charges [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Abstract]                
Franchise Rights, Measurement Input               0.062
Carrying value | Fair Value, Nonrecurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity investment without readily determinable fair value   123,100,000   123,100,000     50,800,000  
Carrying value | Fair Value, Nonrecurring | Waymo LLC [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity investment without readily determinable fair value           $ 94,500,000    
Carrying value | Continuing Operations                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Net assets held for sale   $ 20,600,000   $ 20,600,000     $ 45,300,000