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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
May 28, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment $ 0.0 $ (16.6) $ 0.0 $ (16.6)  
Defined Benefit Plan, Pension Plan Obligations Transferred         $ 234.0
Defined Benefit Plan, Pension Plan Assets Transferred         $ 224.0
Pension Plan, Defined Benefit [Member]          
Service costs 0.1 0.5 0.2 1.0  
Interest costs 0.4 3.8 0.8 7.6  
Amortization of prior service costs (credits), net (0.1) 0.0 (0.1) (0.1)  
Expected return on plan assets (gains) (0.4) (4.7) (0.9) (9.3)  
Net periodic benefit cost (credit) 0.0 (17.0) 0.0 (17.4)  
Postretirement Health and Life Benefits Plans [Member]          
Interest costs 1.1 1.1 2.2 2.2  
Net periodic benefit cost (credit) $ 1.1 $ 1.1 $ 2.2 $ 2.2