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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - USD ($)
4 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Franchise rights   $ 432,400,000 $ 348,100,000  
Gain/(Loss) on franchise rights   (15,400,000) 0 $ 0
Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain/(Loss) on assets held for sale   (3,800,000) (1,300,000)  
Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Franchise rights   3,100,000 0  
Long-lived assets held for sale   22,900,000 21,000,000  
Continuing Operations [Member] | Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain/(Loss) on assets held and used   (3,100,000) 0  
Gain/(Loss) on assets held for sale   (3,000,000) (1,100,000)  
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   24,900,000 0  
Long-lived assets held for sale   17,600,000 14,100,000  
Discontinued Operations, Held-for-sale [Member] | Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain/(Loss) on assets held for sale   (800,000) (200,000)  
Discontinued Operations, Held-for-sale [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   5,300,000 6,900,000  
Franchise Rights [Member] | Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain/(Loss) on franchise rights $ 0 $ (15,400,000.0) $ 0