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Retirement Benefits (Schedule of Fair Value Disclosures) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | $ 13,708.7 | $ 13,195.8 | $ 16,416.0
Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,580.3 | 2,492.5 | $ 3,361.4
U.S. | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,379.7 | 1,132.4 |
U.S. | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 127.0 | 104.2 |
International | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,408.9 | 1,177.1 |
International | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 89.9 | 72.0 |
Developed markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,783.9 | 2,445.5 |
Developed markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 74.9 | 63.1 |
Developed markets - repurchase agreements | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | (772.8) | (706.6) |
Emerging markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 295.6 | 273.5 |
Emerging markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 23.4 | 21.0 |
Hedge funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 3,125.9 | 3,249.0 |
Hedge funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 281.2 | 294.9 |
Equity-like funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 4,093.7 | 4,014.1 |
Equity-like funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 335.1 | 332.8 |
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 | 1,526.5 | 1,470.8 |
Real estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 369.7 | 349.1 |
Real estate | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 24.5 | 21.6 |
Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,024.1 | 1,261.7 |
Other | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 97.8 | 112.1 |
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 | 1,409.2 | 1,288.7 |
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 | 130.1 | 113.4 |
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 | 490.5 | 396.6 |
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 | 44.2 | 35.7 |
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 | 441.2 | 369.4 |
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 | 38.2 | 31.9 |
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 | 21.2 | 19.8 |
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 | 13.2 | 6.4 |
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 | 10.4 | 10.6 |
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 | 261.9 | 234.9 |
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 | 21.6 |
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 | 170.8 | 251.0 |
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 | 23.2 | 24.2 |
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 | 2,223.3 | 1,546.4 |
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 | 1,603.5 | 1,514.0 |
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 | 0.3 | 0.1 |
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 | 333.4 | 300.9 |
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 | 2,597.3 | 2,058.2 |
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 | 74.9 | 63.1 |
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 | (786.0) | (713.0) |
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 | 35.7 | 32.0 |
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 | 0.0 | 0.0 |
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 | 1,526.5 | 1,470.8 |
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 | 0.0 | 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 | 0.0 | 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 | 42.6 | (131.8) |
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 | 2.1 | (19.9) |
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 | 25.2 | 25.5 |
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 | 2.4 | 2.4 |
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 | 0.0 | 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 | 0.0 | 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 | 0.1 | 0.1 |
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 | 0.0 | 0.0 |
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 | 0.0 |
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 | 25.1 | 25.4 |
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 | 2.4 | 2.4 |
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 | 0.0 | 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 | 0.0 | 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 | 0.0 | 0.0 |
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 | 0.0 | 0.0 |
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 | 10,051.0 | 10,335.2 |
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 | 844.3 | 862.7 |
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 | 888.9 | 735.7 |
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 | 82.8 | 68.5 |
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 | 634.3 | 506.8 |
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 | 51.7 | 40.1 |
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 | 165.3 | 367.4 |
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 | 0.0 | 0.0 |
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 | 249.5 | 230.9 |
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 | 23.4 | 21.0 |
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 | 3,125.9 | 3,249.0 |
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 | 281.2 | 294.9 |
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 | 4,068.6 | 3,988.7 |
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 | 332.7 | 330.4 |
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 | 107.8 | 114.2 |
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 | 0.0 |
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 | 810.7 | 1,142.5 |
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 | $ 72.5 | $ 107.8 |

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