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Financial Instruments and Fair Value Measurements (Assets Measured on a Nonrecurring Basis) (Details) - Nonrecurring Basis - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on equity investment |  |  | $ (8.4) | $ 0.0 |
Gain/(Loss) on assets held and used | $ (6.5) | $ (0.5) | (8.9) | (2.7) |
Gain/(Loss) on assets held for sale | (1.3) |  | (1.3) | 0.0 |
Carrying value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity investment | 49.8 |  | 49.8 |  | $ 56.7
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity investment | 48.3 | 0.0 | 48.3 | 0.0 |
Long-lived assets held and used | 0.0 | 0.0 | 0.0 | 0.0 |
Long-lived assets held for sale | $ 12.1 | $ 0.0 | $ 12.1 | $ 0.0 |

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