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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on franchise rights	$ (8.1)	$ 0.0	$ (8.1)	$ 0.0
Franchise rights impairment	8.1	0.0	8.1	0.0
Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on assets held and used			(1.0)	0.0
Gain/(Loss) on assets held for sale, continuing operations			(0.6)	0.2
Continuing Operations [Member] | Fair Value, Measurements, 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	0.0	0.0	0.0
Long-lived assets held for sale in continuing operations	7.4	2.9	7.4	2.9
Reported Value Measurement [Member] | Continuing Operations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	83.3		83.3		$ 169.1
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	14.5		14.5		$ 14.4
Franchise Rights [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on franchise rights			(8.1)	0.0
Franchise rights impairment			8.1	0.0
Franchise Rights [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Franchise rights	$ 31.7	$ 0.0	$ 31.7	$ 0.0

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Fair value portion of assets classified as held for sale.

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