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Retirement Benefits - Schedule of Fair Value Disclosures (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | $ 13,658.4 | $ 13,708.7 | $ 13,195.8
Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,565.8 | 2,580.3 | $ 2,492.5
U.S. | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,905.6 | 1,379.7 |
U.S. | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 184.2 | 127.0 |
International | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 1,517.3 | 1,408.9 |
International | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 103.7 | 89.9 |
Developed markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 2,343.2 | 2,783.9 |
Developed markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 63.0 | 74.9 |
Developed markets - repurchase agreements | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | (641.0) | (772.8) |
Emerging markets | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 320.4 | 295.6 |
Emerging markets | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 26.0 | 23.4 |
Hedge funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 3,057.6 | 3,125.9 |
Hedge funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 285.2 | 281.2 |
Equity-like funds | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 3,931.5 | 4,093.7 |
Equity-like funds | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 346.1 | 335.1 |
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 | 1,464.9 | 1,526.5 |
Real estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 450.9 | 369.7 |
Real estate | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 28.4 | 24.5 |
Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 772.9 | 1,024.1 |
Other | Retiree Health Benefit Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Line Items] |  |  |
Fair value of plan assets | 64.3 | 97.8 |
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 | 1,408.9 | 1,409.2 |
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 | 129.9 | 130.1 |
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 | 602.4 | 490.5 |
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 | 56.9 | 44.2 |
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 | 453.7 | 441.2 |
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 | 41.0 | 38.2 |
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 | 20.6 | 21.2 |
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 | 13.2 |
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 | 21.0 | 10.4 |
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 | 301.0 | 261.9 |
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 | 28.4 | 24.5 |
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 | 10.2 | 170.8 |
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 | 3.6 | 23.2 |
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 | 1,918.7 | 2,223.3 |
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 | 1,520.9 | 1,603.5 |
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 | 0.3 |
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 | 336.7 | 333.4 |
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 | 2,161.9 | 2,597.3 |
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 | 63.0 | 74.9 |
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 | (641.0) | (786.0) |
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 | 34.9 | 35.7 |
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 | 1,464.9 | 1,526.5 |
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 | 25.9 | 42.6 |
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 | (7.0) | 2.1 |
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 | 9.5 | 25.2 |
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 | 0.9 | 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 | 9.4 | 25.1 |
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 | 0.9 | 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 | 10,321.3 | 10,051.0 |
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 | 914.1 | 844.3 |
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 | 1,302.9 | 888.9 |
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 | 127.3 | 82.8 |
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 | 726.9 | 634.3 |
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 | 62.7 | 51.7 |
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 | 160.6 | 165.3 |
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 | 264.5 | 249.5 |
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 | 26.0 | 23.4 |
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 | 3,057.6 | 3,125.9 |
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 | 285.2 | 281.2 |
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 | 3,922.1 | 4,068.6 |
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 | 345.2 | 332.7 |
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 | 149.9 | 107.8 |
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 | 736.8 | 810.7 |
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 | $ 67.7 | $ 72.5 |

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