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Financial Instruments and Fair Value Measurements (Assets Measured on a Nonrecurring Basis) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Apr. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on goodwill	$ 0	$ (65,300,000)	$ 0	$ (65,300,000)
Gain/(Loss) on franchise rights	0	(71,700,000)	0	(71,700,000)
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on goodwill			0	(65,300,000)
Gain/(Loss) on assets held and used			(9,300,000)	(3,200,000)
Gain/(Loss) on assets held for sale			0	(2,400,000)
Fair Value, Nonrecurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	0	75,200,000	0	75,200,000
Long-lived assets held and used	11,900,000	13,500,000	11,900,000	13,500,000
Long-lived assets held for sale	0	30,400,000	0	30,400,000
Franchise Rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on franchise rights			0
Franchise Rights \| Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on franchise rights		(71,700,000)	0	(71,700,000)
Franchise Rights \| Fair Value, Nonrecurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Franchise rights	$ 0	$ 42,700,000	$ 0	$ 42,700,000
Franchise Rights \| Fair Value, Nonrecurring \| Level 3 \| Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Franchise rights					$ 42,700,000