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Retirement Benefits (Schedule of Fair Value Disclosures) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | $ 14,579.0 | $ 12,858.0 | $ 10,932.6
Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 3,227.0 | 2,768.2 | $ 2,398.1
U.S. | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 737.6 | 794.2 |
U.S. | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 68.3 | 76.5 |
International | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,635.8 | 2,439.2 |
International | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 162.3 | 152.6 |
Developed markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 4,301.3 | 3,661.4 |
Developed markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 101.5 | 82.7 |
Developed markets - repurchase agreements | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | (1,670.8) | (1,659.1) |
Emerging markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 631.0 | 648.0 |
Emerging markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 53.5 | 58.5 |
Hedge funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,661.3 | 2,897.9 |
Hedge funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 229.7 | 250.8 |
Equity-like funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,844.7 | 2,279.3 |
Equity-like funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 223.4 | 187.4 |
Cash value of trust owned insurance contract | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,204.6 | 1,832.2 |
Real estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 558.9 | 570.3 |
Real estate | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 25.8 | 31.3 |
Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,879.2 | 1,226.8 |
Other | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 157.9 | 96.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,915.5 | 1,831.7 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 141.7 | 140.5 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 476.1 | 532.4 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 45.0 | 52.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,102.3 | 1,046.8 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 58.1 | 60.8 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Developed markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2.9 | 4.8 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Developed markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Developed markets - repurchase agreements | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Emerging markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 14.2 | 18.5 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Emerging markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity-like funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity-like funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash value of trust owned insurance contract | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 259.6 | 166.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 24.5 | 16.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 60.4 | 62.9 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 14.1 | 11.4 |
Significant Other Observable Inputs (Level 2) | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,079.2 | 1,499.8 |
Significant Other Observable Inputs (Level 2) | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,331.4 | 1,923.4 |
Significant Other Observable Inputs (Level 2) | U.S. | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | U.S. | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | International | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | International | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Developed markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 3,179.2 | 2,658.9 |
Significant Other Observable Inputs (Level 2) | Developed markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 80.3 | 56.3 |
Significant Other Observable Inputs (Level 2) | Developed markets - repurchase agreements | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | (1,670.8) | (1,659.1) |
Significant Other Observable Inputs (Level 2) | Emerging markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 262.7 | 277.4 |
Significant Other Observable Inputs (Level 2) | Emerging markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 24.7 | 27.0 |
Significant Other Observable Inputs (Level 2) | Hedge funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Hedge funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Equity-like funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Equity-like funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Cash value of trust owned insurance contract | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,204.6 | 1,832.2 |
Significant Other Observable Inputs (Level 2) | Real estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 6.9 | 0.0 |
Significant Other Observable Inputs (Level 2) | Real estate | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.7 | 0.0 |
Significant Other Observable Inputs (Level 2) | Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 301.2 | 222.6 |
Significant Other Observable Inputs (Level 2) | Other | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 21.1 | 7.9 |
Significant Unobservable Inputs (Level 3) | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 41.8 | 27.5 |
Significant Unobservable Inputs (Level 3) | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 4.0 | 2.7 |
Significant Unobservable Inputs (Level 3) | U.S. | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | U.S. | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.1 | 0.0 |
Significant Unobservable Inputs (Level 3) | International | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | International | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Developed markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Developed markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Developed markets - repurchase agreements | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Emerging markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.1 | 4.1 |
Significant Unobservable Inputs (Level 3) | Emerging markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.4 |
Significant Unobservable Inputs (Level 3) | Hedge funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Hedge funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Equity-like funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 16.9 | 16.8 |
Significant Unobservable Inputs (Level 3) | Equity-like funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1.6 | 1.6 |
Significant Unobservable Inputs (Level 3) | Cash value of trust owned insurance contract | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Real estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 5.8 | 0.0 |
Significant Unobservable Inputs (Level 3) | Real estate | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.6 | 0.0 |
Significant Unobservable Inputs (Level 3) | Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 18.0 | 6.6 |
Significant Unobservable Inputs (Level 3) | Other | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1.7 | 0.7 |
Investments Valued at Net Asset Value | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 10,542.5 | 9,499.0 |
Investments Valued at Net Asset Value | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 749.9 | 701.6 |
Investments Valued at Net Asset Value | U.S. | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 260.5 | 261.7 |
Investments Valued at Net Asset Value | U.S. | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 23.2 | 24.4 |
Investments Valued at Net Asset Value | International | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,533.5 | 1,392.4 |
Investments Valued at Net Asset Value | International | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 104.2 | 91.8 |
Investments Valued at Net Asset Value | Developed markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,119.2 | 997.7 |
Investments Valued at Net Asset Value | Developed markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 21.2 | 26.4 |
Investments Valued at Net Asset Value | Developed markets - repurchase agreements | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Investments Valued at Net Asset Value | Emerging markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 354.0 | 348.0 |
Investments Valued at Net Asset Value | Emerging markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 28.8 | 31.1 |
Investments Valued at Net Asset Value | Hedge funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,661.3 | 2,897.9 |
Investments Valued at Net Asset Value | Hedge funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 229.7 | 250.8 |
Investments Valued at Net Asset Value | Equity-like funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,827.8 | 2,262.5 |
Investments Valued at Net Asset Value | Equity-like funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 221.8 | 185.8 |
Investments Valued at Net Asset Value | Cash value of trust owned insurance contract | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Investments Valued at Net Asset Value | Real estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 286.6 | 404.1 |
Investments Valued at Net Asset Value | Real estate | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 0.0 | 15.1 |
Investments Valued at Net Asset Value | Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,499.6 | 934.7 |
Investments Valued at Net Asset Value | Other | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | $ 121.0 | $ 76.2 |

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