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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
May 28, 2024
Oct. 12, 2023
Dec. 31, 2022
Defined Benefit Plan, Benefit Obligation               $ 527.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment $ (0.2) $ (0.9) $ (16.8) $ (0.9)        
Portion of Defined Benefit Plan, Benefit Obligation related to Annuity   $ 30.6   $ 30.6        
Income (Loss) Related To Pension Settlement         $ 28.6      
Pension Plan, Defined Benefit [Member]                
Defined Benefit Plan, Pension Plan Obligation Transferred           $ 234.0 $ 186.5  
Defined Benefit Plan, Plan Assets, Amount $ 15.4   $ 15.4     $ 224.0 $ 171.4