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Retirement Benefits - Information Comparing Plan Assets to Plan Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Total |  |
Information for pension plans with an ABO in excess of plan assets: |  |
Fair value of plan assets | $ 681.2 | $ 890.7
Accumulated benefit obligation | 798.2 | 1,089.3
Projected benefit obligation | 818.3 | 1,115.7
U.S. Plans |  |
Information for pension plans with an ABO in excess of plan assets: |  |
Fair value of plan assets | 596.3 | 764.8
Accumulated benefit obligation | 627.2 | 839.5
Projected benefit obligation | 627.2 | 839.5
Non-U.S. Plans |  |
Information for pension plans with an ABO in excess of plan assets: |  |
Fair value of plan assets | 84.9 | 125.9
Accumulated benefit obligation | 171.0 | 249.8
Projected benefit obligation | $ 191.1 | $ 276.2

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