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Financial Instruments And Fair Value Measurements (Assets Measured on a Nonrecurring Basis) (Details) - Nonrecurring Basis - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gain/(Loss) on assets held and used $ (2.7) $ (1.0)
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-lived assets held and used $ 0.0 $ 0.0