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Savings, Pension and Other Postretirement Employee Benefit Plans - Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 1.9 | $ 1.6
Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 231.1 | 231.7
Defined Benefit Plan, Common Collective Trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 229.2 | 230.1
Fair Value, Inputs, Level 1 | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1.9 | 1.6
Fair Value, Inputs, Level 1 | Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1.9 | 1.6
Fair Value, Inputs, Level 1 | Defined Benefit Plan, Common Collective Trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Fair Value Measured at Net Asset Value Per Share | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Fair Value Measured at Net Asset Value Per Share | Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 229.2 | 230.1
Fair Value Measured at Net Asset Value Per Share | Defined Benefit Plan, Common Collective Trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 229.2 | $ 230.1

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