Financial Instruments And Fair Value Measurements (Assets Measured on a Nonrecurring Basis) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investment	$ 56,700,000		$ 56,700,000
Reported Value Measurement | Continuing Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	8,400,000		53,300,000
Reported Value Measurement | Discontinued Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale in discontinued operations	1,100,000		$ 1,100,000
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]
Gain/(Loss) on equity investment	0	3,400,000
Gain/(Loss) on right-of-use assets	0	(100,000)
Gain/(Loss) on assets held and used	(1,000,000.0)	(3,100,000)
Nonrecurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investment	0	53,400,000
Right-of-use assets	0	0
Long-lived assets held and used	$ 0	$ 10,400,000