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Retirement Benefits - Schedule of Expected Benefit Payments, Contributions and Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]      
Projected benefit obligation $ 2,297.0 $ 2,395.3  
Fair value of plan assets 1,058.4 1,035.4  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Fair value of plan assets 1,058.4 1,035.4  
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract]      
Total other comprehensive income (loss) during period 651.8 (776.5) $ 616.9
Defined Benefit Pension Plans      
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2025 677.0    
2026 694.4    
2027 721.4    
2028 746.9    
2029 778.4    
2030 - 2034 4,388.7    
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]      
Fair value of plan assets 595.0 564.3  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Accumulated benefit obligation 1,655.8 1,659.5  
Fair value of plan assets 595.0 564.3  
Components of net periodic (benefit) cost:      
Service cost 338.7 290.4 351.7
Interest cost 661.7 648.2 398.1
Expected return on plan assets (1,112.2) (1,055.0) (947.6)
Amortization of prior service (benefit) cost 2.1 2.4 2.4
Recognized actuarial (gain) loss 125.1 122.0 342.4
Net periodic (benefit) cost 15.4 8.0 147.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract]      
Actuarial gain (loss) arising during period 554.5 (763.9) 823.6
Amortization of prior service (benefit) cost included in net income 2.1 2.4 2.4
Amortization of net actuarial (gain) loss included in net income 125.1 122.0 342.4
Foreign currency exchange rate changes and other 15.6 (29.2) 55.5
Total other comprehensive income (loss) during period 697.3 (668.7) 1,223.9
Retiree Health Benefit Plans      
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2025 93.4    
2026 93.6    
2027 94.4    
2028 95.0    
2029 95.1    
2030 - 2034 477.5    
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]      
Fair value of plan assets 0.0 0.0  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Accumulated benefit obligation 141.5 157.7  
Fair value of plan assets 0.0 0.0  
Components of net periodic (benefit) cost:      
Service cost 35.4 31.8 46.6
Interest cost 62.1 61.3 37.8
Expected return on plan assets (192.3) (182.1) (152.1)
Amortization of prior service (benefit) cost (5.6) (52.9) (54.8)
Recognized actuarial (gain) loss (2.6) (5.8) 0.9
Net periodic (benefit) cost (103.0) (147.7) (121.6)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract]      
Actuarial gain (loss) arising during period (37.2) (49.8) (552.2)
Amortization of prior service (benefit) cost included in net income (5.6) (52.9) (54.8)
Amortization of net actuarial (gain) loss included in net income (2.6) (5.8) 0.9
Foreign currency exchange rate changes and other (0.1) 0.7 (0.9)
Total other comprehensive income (loss) during period $ (45.5) $ (107.8) $ (607.0)