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Retirement Benefits - Summary of Basis Used to Measure Defined Benefit Plans Assets at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 46.0 | $ 42.5
U.S. Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.2 | 0.2
U.S. Small / Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 2.1 | 2.5
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 2.4 | 2.5
U.S. Intermediate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 2.5 | 1.6
U.S. Long Term |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 3.3 | 3.8
U.S. High Yield |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.5 | 0.4
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 6.4 | 5.4
Other Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 25.8 | 23.7
Cash and Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1.1 | 1.0
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1.7 | 1.4
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1.8 | 1.6
Level 1 | U.S. Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.2 | 0.2
Level 1 | U.S. Small / Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 1 | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.8 | 0.8
Level 1 | U.S. Intermediate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 1 | U.S. Long Term |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 1 | U.S. High Yield |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 1 | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.2 | 0.2
Level 1 | Other Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 1 | Cash and Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.6 | 0.4
Level 1 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 18.4 | 17.2
Level 2 | U.S. Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 2 | U.S. Small / Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 2.1 | 2.5
Level 2 | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1.6 | 1.7
Level 2 | U.S. Intermediate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 2.5 | 1.6
Level 2 | U.S. Long Term |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 3.3 | 3.8
Level 2 | U.S. High Yield |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.5 | 0.4
Level 2 | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 6.2 | 5.2
Level 2 | Other Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 2 | Cash and Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.5 | 0.6
Level 2 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 1.7 | 1.4
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 25.8 | 23.7
Level 3 | U.S. Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 3 | U.S. Small / Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 3 | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 3 | U.S. Intermediate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 3 | U.S. Long Term |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 3 | U.S. High Yield |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 3 | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 3 | Other Commingled Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 25.8 | 23.7
Level 3 | Cash and Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | 0.0 | 0.0
Level 3 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, fair value of plan assets | $ 0.0 | $ 0.0

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