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Financial Instruments and Fair Value Measurements (Assets Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Apr. 30, 2025 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Gain/(Loss) on goodwill | $ 0.0 |  | $ 0.0 | $ (65.3) | $ 0.0 |  |
Gain/(Loss) on franchise rights | 0.0 |  | 0.0 | (71.7) | 0.0 |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Gain/(Loss) on equity investment |  |  |  | 0.0 | (8.4) |  |
Gain/(Loss) on goodwill |  |  |  | (65.3) | 0.0 |  |
Gain/(Loss) on assets held and used |  |  |  | (4.3) | (8.9) |  |
Gain/(Loss) on assets held for sale |  |  |  | (2.4) | (1.3) |  |
Fair Value, Nonrecurring [Member] | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Equity investment | 0.0 |  | 48.3 | 0.0 | 48.3 |  |
Goodwill | 75.2 |  | 0.0 | 75.2 | 0.0 |  |
Long-lived assets held and used | 13.5 |  | 0.0 | 13.5 | 0.0 |  |
Long-lived assets held for sale | 22.7 |  | 12.1 | 22.7 | 12.1 |  |
Franchise Rights | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Gain/(Loss) on franchise rights |  | $ (71.7) |  | (71.7) | 0.0 |  |
Franchise Rights | Fair Value, Nonrecurring [Member] | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Franchise rights | 42.7 |  | $ 0.0 | 42.7 | $ 0.0 |  |
Franchise Rights | Fair Value, Nonrecurring [Member] | Level 3 | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Franchise rights |  |  |  |  |  | $ 42.7 |
Carrying value | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Equity investment | $ 50.5 |  |  | $ 50.5 |  |  | $ 49.8

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