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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Franchise rights impairment $ 0.0 $ 0.0 $ 9.6 $ 8.1  
Fair Value, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Gain/(Loss) on franchise rights and other     (9.9) (8.1)  
Gain/(Loss) on right-of-use assets     (0.2) 0.0  
Gain/(Loss) on assets held and used     (0.1) (1.6)  
Gain/(Loss) on assets held for sale     (2.1) (0.6)  
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 8.9 31.7 8.9 31.7  
Right-of-use assets 0.1 0.0 0.1 0.0  
Long-lived assets held and used 0.0 0.0 0.0 0.0  
Assets held for sale 31.5 7.4 31.5 7.4  
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     (1.6) (0.6)  
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]          
Assets held for sale 26.1 7.4 26.1 7.4  
Discontinued 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     (0.5) 0.0  
Discontinued 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]          
Assets held for sale 5.4 0.0 5.4 0.0  
Reported Value Measurement [Member] | Continuing Operations [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets held for sale 114.2   114.2   $ 67.8
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 13.3   13.3   $ 14.1
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 $ 0.0 $ 9.6 $ 8.1