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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

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