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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain/(Loss) on Equity Investment   $ 25,700,000 $ 0 $ 0
Gain/(Loss) on assets held for sale $ (26,200,000)      
Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain/(loss) on Franchise rights and other   (9,900,000) (8,100,000)  
Gain/(Loss) on Equity Investment   25,700,000 0  
Gain/(Loss) on Right-of-use assets   (200,000) 0  
Gain/(Loss) on assets held for sale   (2,100,000) (600,000)  
Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Franchise rights   8,900,000 31,700,000  
Equity investment   75,700,000 0  
Right of Use Asset   100,000 0  
Long-lived assets held for sale   31,500,000 7,400,000  
Continuing Operations [Member] | Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain/(Loss) on assets long-lived assets held and used   (100,000) (2,600,000)  
Gain/(Loss) on assets held for sale   (1,600,000) (600,000)  
Continuing Operations [Member] | 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 and used   0 0  
Long-lived assets held for sale   26,100,000 7,400,000  
Discontinued Operations [Member] | Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain/(Loss) on assets held for sale   (500,000) 0  
Discontinued Operations [Member] | 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   $ 5,400,000 $ 0