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Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment     $ 0    
Franchise Rights          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Franchise rights impairment     0 $ 0  
Nonrecurring Basis          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of assets held and used $ 6,500,000 $ 500,000 8,900,000 2,700,000  
Impairment of assets held for sale 1,300,000   1,300,000 $ 0  
Carrying value | Continuing Operations          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets held for sale $ 58,200,000   $ 58,200,000   $ 21,300,000