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Pensions and Postretirement Benefits Other Than Pensions (Schedule of Net Periodic Postretirement Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net periodic benefit cost after net curtailment and settlement (gains) losses $ (11.6) $ (20.0) $ (10.6)
Postretirement Benefit Costs [Member]      
Service cost 1.2 1.4 1.8
Interest cost 11.5 13.3 6.9
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0.6 0.6 0.0
Net periodic benefit cost after net curtailment and settlement (gains) losses 0.1 2.3 3.1
Plan net actuarial losses, net amortization of (13.2) (13.0) (5.6)
Segment, Continuing Operations [Member] | Postretirement Benefit Costs [Member]      
Net periodic benefit cost after net curtailment and settlement (gains) losses
Segment, Discontinued Operations [Member] | Postretirement Benefit Costs [Member]      
Net periodic benefit cost after net curtailment and settlement (gains) losses (1.2) (0.5) (0.1)
Operating Income (Loss) [Member] | Segment, Continuing Operations [Member] | Postretirement Benefit Costs [Member]      
Net periodic benefit cost after net curtailment and settlement (gains) losses 1.2 1.4 1.8
Other Nonoperating Income (Expense) [Member] | Segment, Continuing Operations [Member] | Postretirement Benefit Costs [Member]      
Net periodic benefit cost after net curtailment and settlement (gains) losses $ 0.1 $ 1.4 $ 1.4