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Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Schedule of Changes in Accumulated Postemployment Benefit Obligations | We use a measurement date of December 31 to develop the change in benefit obligation, change in plan assets, funded status, and amounts recognized in the consolidated balance sheets at December 31 for our defined benefit pension and retiree health benefit plans, which were as follows:
| Defined Benefit Pension Plans |  | Retiree Health Benefit Plans
| 2020 |  | 2019 |  | 2020 |  | 2019
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 16,251.0 |  |  | $ | 13,427.1 |  |  | $ | 1,601.4 |  |  | $ | 1,540.0 |
Service cost | 325.5 |  |  | 250.4 |  |  | 40.8 |  |  | 36.3 |
Interest cost | 425.8 |  |  | 486.0 |  |  | 43.7 |  |  | 58.0 |
Actuarial loss | 1,563.1 |  |  | 2,631.7 |  |  | 142.1 |  |  | 54.3 |
Benefits paid | (587.2) |  |  | (584.2) |  |  | (75.1) |  |  | (87.3) |
Curtailment (gain) loss | 2.2 |  |  | (16.8) |  |  | — |  |  | (0.5) |
Foreign currency exchange rate changes and other adjustments | 245.1 |  |  | 56.8 |  |  | 0.8 |  |  | 0.6 |
Benefit obligation at end of year | 18,225.5 |  |  | 16,251.0 |  |  | 1,753.7 |  |  | 1,601.4 |
Schedule of Changes in Fair Value of Plan Assets |
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 12,858.0 |  |  | 10,932.6 |  |  | 2,768.2 |  |  | 2,398.1 |
Actual return on plan assets | 1,802.4 |  |  | 2,012.0 |  |  | 539.0 |  |  | 444.1 |
Employer contribution | 318.8 |  |  | 429.9 |  |  | (5.1) |  |  | 13.2 |
Benefits paid | (587.2) |  |  | (584.2) |  |  | (75.1) |  |  | (87.3) |
Foreign currency exchange rate changes and other adjustments | 187.0 |  |  | 67.7 |  |  | — |  |  | 0.1 |
Fair value of plan assets at end of year | 14,579.0 |  |  | 12,858.0 |  |  | 3,227.0 |  |  | 2,768.2 |
Schedule of Net Funded Status |
Funded status | (3,646.5) |  |  | (3,393.0) |  |  | 1,473.3 |  |  | 1,166.8 |
Unrecognized net actuarial (gain) loss | 6,515.5 |  |  | 6,177.6 |  |  | (349.1) |  |  | (111.6) |
Unrecognized prior service (benefit) cost | 15.4 |  |  | 17.4 |  |  | (177.6) |  |  | (236.4) |
Net amount recognized | $ | 2,884.4 |  |  | $ | 2,802.0 |  |  | $ | 946.6 |  |  | $ | 818.8 |
Schedule of Amounts Recognized in Balance Sheet |
Amounts recognized in the consolidated balance sheet consisted of: |  |  |  |  |  |  |
Other noncurrent assets | $ | 299.6 |  |  | $ | 163.3 |  |  | $ | 1,697.0 |  |  | $ | 1,381.3 |
Other current liabilities | (67.9) |  |  | (65.3) |  |  | (7.4) |  |  | (7.3) |
Accrued retirement benefits | (3,878.2) |  |  | (3,491.0) |  |  | (216.3) |  |  | (207.2) |
Accumulated other comprehensive (income) loss before income taxes | 6,530.9 |  |  | 6,195.0 |  |  | (526.7) |  |  | (348.0) |
Net amount recognized | $ | 2,884.4 |  |  | $ | 2,802.0 |  |  | $ | 946.6 |  |  | $ | 818.8 |
Schedule of Assumptions Used | The following represents our weighted-average assumptions as of December 31:
| Defined Benefit Pension Plans |  | Retiree Health Benefit Plans
(Percents) | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Discount rate for benefit obligation | 2.4 | % |  | 3.0 | % |  | 4.0 | % |  | 2.6 | % |  | 3.3 | % |  | 4.4 | %
Discount rate for net benefit costs | 3.0 |  |  | 4.0 |  |  | 3.4 |  |  | 3.3 |  |  | 4.4 |  |  | 3.7 |
Rate of compensation increase for benefit obligation | 3.3 |  |  | 3.3 |  |  | 3.4 |  |  |  |  |  |  |
Rate of compensation increase for net benefit costs | 3.3 |  |  | 3.4 |  |  | 3.4 |  |  |  |  |  |  |
Expected return on plan assets for net benefit costs | 7.3 |  |  | 7.4 |  |  | 7.4 |  |  | 6.0 |  |  | 6.0 |  |  | 8.0 |
Schedule of Expected Benefit Payments | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid as follows:
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026-2030
Defined benefit pension plans | $ | 639.2 |  |  | $ | 635.3 |  |  | $ | 645.8 |  |  | $ | 673.1 |  |  | $ | 689.6 |  |  | $ | 3,800.8 |
Retiree health benefit plans | 91.2 |  |  | 91.2 |  |  | 91.2 |  |  | 94.9 |  |  | 95.7 |  |  | 481.8 |
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets | Amounts relating to defined benefit pension plans with projected benefit obligations in excess of plan assets were as follows at December 31:
| 2020 |  | 2019
Projected benefit obligation | $ | 15,770.7 |  |  | $ | 14,039.7 |
Fair value of plan assets | 11,824.4 |  |  | 10,483.4 |
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets | Amounts relating to defined benefit pension plans and retiree health benefit plans with accumulated benefit obligations in excess of plan assets were as follows at December 31:
| Defined Benefit Pension Plans |  | Retiree Health Benefit Plans
| 2020 |  | 2019 |  | 2020 |  | 2019
Accumulated benefit obligation | $ | 14,682.3 |  |  | $ | 13,063.7 |  |  | $ | 223.8 |  |  | $ | 214.4 |
Fair value of plan assets | 11,824.4 |  |  | 10,483.4 |  |  | — |  |  | — |
Schedule of Net Benefit Costs | Net pension and retiree health benefit expense included the following components:
| Defined Benefit Pension Plans |  | Retiree Health Benefit Plans
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Components of net periodic (benefit) cost: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 325.5 |  |  | $ | 250.4 |  |  | $ | 292.7 |  |  | $ | 40.8 |  |  | $ | 36.3 |  |  | $ | 41.5 |
Interest cost | 425.8 |  |  | 486.0 |  |  | 458.5 |  |  | 43.7 |  |  | 58.0 |  |  | 57.3 |
Expected return on plan assets | (901.5) |  |  | (839.6) |  |  | (842.1) |  |  | (158.1) |  |  | (144.3) |  |  | (177.9) |
Amortization of prior service (benefit) cost | 4.5 |  |  | 6.1 |  |  | 4.6 |  |  | (59.5) |  |  | (62.9) |  |  | (79.5) |
Recognized actuarial loss (gain) | 396.3 |  |  | 284.9 |  |  | 332.5 |  |  | (3.0) |  |  | 1.9 |  |  | 6.1 |
Curtailment (gain) loss | — |  |  | 2.2 |  |  | 1.3 |  |  | — |  |  | — |  |  | (29.3) |
Net periodic (benefit) cost | $ | 250.6 |  |  | $ | 190.0 |  |  | $ | 247.5 |  |  | $ | (136.1) |  |  | $ | (111.0) |  |  | $ | (181.8) |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) | The following represents the amounts recognized in other comprehensive income (loss) for the years ended December 31, 2020, 2019, and 2018:
| Defined Benefit Pension Plans |  | Retiree Health Benefit Plans
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Actuarial gain (loss) arising during period | $ | (663.0) |  |  | $ | (1,461.0) |  |  | $ | 182.8 |  |  | $ | 238.8 |  |  | $ | 246.1 |  |  | $ | 37.5 |
Plan amendments during period | (2.2) |  |  | — |  |  | (17.6) |  |  | — |  |  | — |  |  | 14.1 |
Curtailment gain (loss) | — |  |  | 19.0 |  |  | 45.2 |  |  | — |  |  | — |  |  | (31.8) |
Amortization of prior service (benefit) cost included in net income | 4.5 |  |  | 6.1 |  |  | 4.6 |  |  | (59.5) |  |  | (62.9) |  |  | (79.5) |
Amortization of net actuarial loss included in net income | 396.3 |  |  | 284.9 |  |  | 332.5 |  |  | (3.0) |  |  | 1.9 |  |  | 6.1 |
Foreign currency exchange rate changes and other | (71.5) |  |  | (7.7) |  |  | 47.1 |  |  | 2.4 |  |  | 3.6 |  |  | (0.1) |
Total other comprehensive income (loss) during period | $ | (335.9) |  |  | $ | (1,158.7) |  |  | $ | 594.6 |  |  | $ | 178.7 |  |  | $ | 188.7 |  |  | $ | (53.7) |
Schedule of Allocation of Plan Assets | The fair values of our defined benefit pension plan and retiree health plan assets as of December 31, 2020 by asset category were as follows:
|  |  | Fair Value Measurements Using |  |
Asset Class | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Investments Valued at Net Asset Value(1)
Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |
Public equity securities: |  |  |  |  |  |  |  |  |
U.S. | $ | 737.6 |  |  | $ | 476.1 |  |  | $ | — |  |  | $ | 1.0 |  |  | $ | 260.5 |
International | 2,635.8 |  |  | 1,102.3 |  |  | — |  |  | — |  |  | 1,533.5 |
Fixed income: |  |  |  |  |  |  |  |  |
Developed markets | 4,301.3 |  |  | 2.9 |  |  | 3,179.2 |  |  | — |  |  | 1,119.2 |
Developed markets - repurchase agreements | (1,670.8) |  |  | — |  |  | (1,670.8) |  |  | — |  |  | — |
Emerging markets | 631.0 |  |  | 14.2 |  |  | 262.7 |  |  | 0.1 |  |  | 354.0 |
Private alternative investments: |  |  |  |  |  |  |  |  |
Hedge funds | 2,661.3 |  |  | — |  |  | — |  |  | — |  |  | 2,661.3 |
Equity-like funds | 2,844.7 |  |  | — |  |  | — |  |  | 16.9 |  |  | 2,827.8 |
Real estate | 558.9 |  |  | 259.6 |  |  | 6.9 |  |  | 5.8 |  |  | 286.6 |
Other | 1,879.2 |  |  | 60.4 |  |  | 301.2 |  |  | 18.0 |  |  | 1,499.6 |
Total | $ | 14,579.0 |  |  | $ | 1,915.5 |  |  | $ | 2,079.2 |  |  | $ | 41.8 |  |  | $ | 10,542.5 |
Retiree Health Benefit Plans |  |  |  |  |  |  |  |  |
Public equity securities: |  |  |  |  |  |  |  |  |
U.S. | $ | 68.3 |  |  | $ | 45.0 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 23.2 |
International | 162.3 |  |  | 58.1 |  |  | — |  |  | — |  |  | 104.2 |
Fixed income: |  |  |  |  |  |  |  |  |
Developed markets | 101.5 |  |  | — |  |  | 80.3 |  |  | — |  |  | 21.2 |
Emerging markets | 53.5 |  |  | — |  |  | 24.7 |  |  | — |  |  | 28.8 |
Private alternative investments: |  |  |  |  |  |  |  |  |
Hedge funds | 229.7 |  |  | — |  |  | — |  |  | — |  |  | 229.7 |
Equity-like funds | 223.4 |  |  | — |  |  | — |  |  | 1.6 |  |  | 221.8 |
Cash value of trust owned insurance contract | 2,204.6 |  |  | — |  |  | 2,204.6 |  |  | — |  |  | — |
Real estate | 25.8 |  |  | 24.5 |  |  | 0.7 |  |  | 0.6 |  |  | — |
Other | 157.9 |  |  | 14.1 |  |  | 21.1 |  |  | 1.7 |  |  | 121.0 |
Total | $ | 3,227.0 |  |  | $ | 141.7 |  |  | $ | 2,331.4 |  |  | $ | 4.0 |  |  | $ | 749.9 |
(1) Certain investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. The fair values of our defined benefit pension plan and retiree health plan assets as of December 31, 2019 by asset category were as follows:
|  |  | Fair Value Measurements Using |  |
Asset Class | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Investments Valued at Net Asset Value(1)
Defined Benefit Pension Plans |  |  |  |  |  |  |  |  |
Public equity securities: |  |  |  |  |  |  |  |  |
U.S. | $ | 794.2 |  |  | $ | 532.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 261.7 |
International | 2,439.2 |  |  | 1,046.8 |  |  | — |  |  | — |  |  | 1,392.4 |
Fixed income: |  |  |  |  |  |  |  |  |
Developed markets | 3,661.4 |  |  | 4.8 |  |  | 2,658.9 |  |  | — |  |  | 997.7 |
Developed markets - repurchase agreements | (1,659.1) |  |  | — |  |  | (1,659.1) |  |  | — |  |  | — |
Emerging markets | 648.0 |  |  | 18.5 |  |  | 277.4 |  |  | 4.1 |  |  | 348.0 |
Private alternative investments: |  |  |  |  |  |  |  |  |
Hedge funds | 2,897.9 |  |  | — |  |  | — |  |  | — |  |  | 2,897.9 |
Equity-like funds | 2,279.3 |  |  | — |  |  | — |  |  | 16.8 |  |  | 2,262.5 |
Real estate | 570.3 |  |  | 166.2 |  |  | — |  |  | — |  |  | 404.1 |
Other | 1,226.8 |  |  | 62.9 |  |  | 222.6 |  |  | 6.6 |  |  | 934.7 |
Total | $ | 12,858.0 |  |  | $ | 1,831.7 |  |  | $ | 1,499.8 |  |  | $ | 27.5 |  |  | $ | 9,499.0 |
Retiree Health Benefit Plans |  |  |  |  |  |  |  |  |
Public equity securities: |  |  |  |  |  |  |  |  |
U.S. | $ | 76.5 |  |  | $ | 52.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 24.4 |
International | 152.6 |  |  | 60.8 |  |  | — |  |  | — |  |  | 91.8 |
Fixed income: |  |  |  |  |  |  |  |  |
Developed markets | 82.7 |  |  | — |  |  | 56.3 |  |  | — |  |  | 26.4 |
Emerging markets | 58.5 |  |  | — |  |  | 27.0 |  |  | 0.4 |  |  | 31.1 |
Private alternative investments: |  |  |  |  |  |  |  |  |
Hedge funds | 250.8 |  |  | — |  |  | — |  |  | — |  |  | 250.8 |
Equity-like funds | 187.4 |  |  | — |  |  | — |  |  | 1.6 |  |  | 185.8 |
Cash value of trust owned insurance contract | 1,832.2 |  |  | — |  |  | 1,832.2 |  |  | — |  |  | — |
Real estate | 31.3 |  |  | 16.2 |  |  | — |  |  | — |  |  | 15.1 |
Other | 96.2 |  |  | 11.4 |  |  | 7.9 |  |  | 0.7 |  |  | 76.2 |
Total | $ | 2,768.2 |  |  | $ | 140.5 |  |  | $ | 1,923.4 |  |  | $ | 2.7 |  |  | $ | 701.6 |
(1) Certain investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy.

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefit obligation and plan assets for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Tabular disclosure of the change in the accumulated postemployment benefit obligation from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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