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Retirement Benefits - Schedule of Benefit Obligations and Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amounts recognized in the consolidated balance sheets consisted of:      
Accrued retirement benefits $ (1,300.5) $ (1,438.8)  
Defined Benefit Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 14,257.9 13,222.0  
Service cost 338.7 290.4 $ 351.7
Interest cost 661.7 648.2 398.1
Actuarial (gain) loss (1,083.6) 590.5  
Benefits paid (634.3) (610.5)  
Foreign currency exchange rate changes and other adjustments (125.0) 117.3  
Benefit obligation at end of year 13,415.4 14,257.9 13,222.0
Change in plan assets:      
Fair value of plan assets at beginning of year 13,658.4 13,708.7 13,195.8
Actual return on plan assets 583.2 881.9  
Employer contribution 115.3 120.6  
Benefits paid (634.3) (610.5)  
Foreign currency exchange rate changes and other adjustments (114.5) 120.9  
Fair value of plan assets at end of year 13,658.4 13,708.7 13,195.8
Funded status 243.0 (549.2)  
Unrecognized net actuarial loss 2,662.9 3,357.9  
Unrecognized prior service (benefit) cost 4.1 6.4  
Net amount recognized 2,910.0 2,815.1  
Amounts recognized in the consolidated balance sheets consisted of:      
Other noncurrent assets 1,481.6 810.6  
Other current liabilities (71.4) (70.4)  
Accrued retirement benefits (1,167.2) (1,289.4)  
Accumulated other comprehensive loss 2,667.0 3,364.3  
Net amount recognized 2,910.0 2,815.1  
Retiree Health Benefit Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 1,310.3 1,258.8  
Service cost 35.4 31.8 46.6
Interest cost 62.1 61.3 37.8
Actuarial (gain) loss (96.5) 34.5  
Benefits paid (82.2) (80.6)  
Foreign currency exchange rate changes and other adjustments (6.4) 4.5  
Benefit obligation at end of year 1,222.7 1,310.3 1,258.8
Change in plan assets:      
Fair value of plan assets at beginning of year 2,565.8 2,580.3 2,492.5
Actual return on plan assets 58.5 166.8  
Employer contribution 9.2 1.7  
Benefits paid (82.2) (80.6)  
Foreign currency exchange rate changes and other adjustments 0.0 (0.1)  
Fair value of plan assets at end of year 2,565.8 2,580.3 $ 2,492.5
Funded status 1,343.1 1,270.0  
Unrecognized net actuarial loss 149.3 109.6  
Unrecognized prior service (benefit) cost (3.7) (9.5)  
Net amount recognized 1,488.7 1,370.1  
Amounts recognized in the consolidated balance sheets consisted of:      
Other noncurrent assets 1,484.6 1,427.7  
Other current liabilities (8.2) (8.3)  
Accrued retirement benefits (133.3) (149.4)  
Accumulated other comprehensive loss 145.6 100.1  
Net amount recognized $ 1,488.7 $ 1,370.1