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Retirement Benefits - Fair Value Measurements (Details) - Non-U.S. Plans - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 245.5 | $ 360.3 | $ 355.8
Level 1 | Other plan assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 88.2 | 119.0 |
Level 2 | Other plan assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 45.3 | 75.7 |
Level 3 | Other insurance contract value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2.7 | 3.0 |
Level 3 | Insurance contract - guarantee value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 75.8 | 109.7 |
Fair Value Measured at Net Asset Value Per Share | Other plan assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 33.5 | $ 52.9 |

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