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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net losses on assets held for sale and impaired $ 0.0 $ 0.0 $ 26.3
Unrealized Gain (Loss) on Investments 8.5    
Investments, Fair Value Disclosure $ 51.9