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Pensions and Postretirement Benefits Other Than Pensions (Schedule of Net Periodic 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)
Pension Plans [Member]      
Service cost 32.1 34.4 47.5
Interest cost 112.9 119.6 70.3
Expected return on plan assets (117.8) (120.3) (103.8)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 3.0 3.6 3.9
Plan net actuarial losses, net amortization of 15.0 16.2 23.3
Net periodic benefit cost 45.2 53.5 41.2
Net curtailment and settlement (gains) losses 1.0 1.4 15.0
Net periodic benefit cost after net curtailment and settlement (gains) losses 46.2 54.9 56.2
Segment, Discontinued Operations [Member] | Pension Plans [Member]      
Net periodic benefit cost after net curtailment and settlement (gains) losses 6.7 6.7 3.8
Other Nonoperating Income (Expense) [Member] | Segment, Continuing Operations [Member] | Pension Plans [Member]      
Net periodic benefit cost after net curtailment and settlement (gains) losses 11.5 18.6 9.2
Operating Income (Loss) [Member] | Segment, Continuing Operations [Member] | Pension Plans [Member]      
Net periodic benefit cost after net curtailment and settlement (gains) losses $ 28.0 $ 29.6 $ 43.2