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Retirement Benefits (Schedule of Expected Benefit Payments, Contributions and Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Projected benefit obligation | $ 3,360.3 | $ 15,770.7 |
Fair value of plan assets | 1,542.8 | 11,824.4 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Fair value of plan assets | 1,542.8 | 11,824.4 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Total other comprehensive income (loss) during period | 2,699.4 | (157.1) | $ (970.0)
Defined Benefit Pension Plans |  |  |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2022 | 631.9 |  |
2023 | 641.8 |  |
2024 | 669.4 |  |
2025 | 686.6 |  |
2026 | 707.5 |  |
2027-2031 | 3,919.7 |  |
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Fair value of plan assets | 973.4 | 11,824.4 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Accumulated benefit obligation | 2,532.0 | 14,682.3 |
Fair value of plan assets | 973.4 | 11,824.4 |
Components of net periodic (benefit) cost: |  |  |
Service cost | 369.2 | 325.5 | 250.4
Interest cost | 337.8 | 425.8 | 486.0
Expected return on plan assets | (949.3) | (901.5) | (839.6)
Amortization of prior service (benefit) cost | 4.2 | 4.5 | 6.1
Recognized actuarial (gain) loss | 487.7 | 396.3 | 284.9
Curtailment loss | 0.0 | 0.0 | 2.2
Net periodic (benefit) cost | 249.6 | 250.6 | 190.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Actuarial gain (loss) arising during period | 2,072.4 | (663.0) | (1,461.0)
Plan amendments during period | 0.0 | (2.2) | 0.0
Curtailment gain | 0.0 | 0.0 | 19.0
Amortization of prior service (benefit) cost included in net income | 4.2 | 4.5 | 6.1
Amortization of net actuarial (gain) loss included in net income | 487.7 | 396.3 | 284.9
Foreign currency exchange rate changes and other | 47.2 | (71.5) | (7.7)
Total other comprehensive income (loss) during period | 2,611.5 | (335.9) | (1,158.7)
Retiree Health Benefit Plans |  |  |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2022 | 89.4 |  |
2023 | 89.5 |  |
2024 | 93.1 |  |
2025 | 93.9 |  |
2026 | 94.5 |  |
2027-2031 | 477.7 |  |
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 | 212.6 | 223.8 |
Fair value of plan assets | 0.0 | 0.0 |
Components of net periodic (benefit) cost: |  |  |
Service cost | 49.2 | 40.8 | 36.3
Interest cost | 32.5 | 43.7 | 58.0
Expected return on plan assets | (146.2) | (158.1) | (144.3)
Amortization of prior service (benefit) cost | (59.6) | (59.5) | (62.9)
Recognized actuarial (gain) loss | 3.2 | (3.0) | 1.9
Curtailment loss | 0.0 | 0.0 | 0.0
Net periodic (benefit) cost | (120.9) | (136.1) | (111.0)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Actuarial gain (loss) arising during period | 142.5 | 238.8 | 246.1
Plan amendments during period | 0.0 | 0.0 | 0.0
Curtailment gain | 0.0 | 0.0 | 0.0
Amortization of prior service (benefit) cost included in net income | (59.6) | (59.5) | (62.9)
Amortization of net actuarial (gain) loss included in net income | 3.2 | (3.0) | 1.9
Foreign currency exchange rate changes and other | 1.9 | 2.4 | 3.6
Total other comprehensive income (loss) during period | $ 88.0 | $ 178.7 | $ 188.7

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