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Employee Benefits - Plan Assets and Investment Policy (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Employee Benefits |  |  |
Weighted-average asset allocations (as a percent) | 100.00% | 100.00% |
Defined Benefit Plan |  |  |
Employee Benefits |  |  |
Total investments at fair value | $ 63.8 | $ 56.7 | $ 70.9
Defined Benefit Plan | Level 1 |  |  |
Employee Benefits |  |  |
Total investments at fair value | 51.7 | 46.1 |
Defined Benefit Plan | Level 2 |  |  |
Employee Benefits |  |  |
Total investments at fair value | 12.1 | 10.6 |
Defined Benefit Plan | Common stock. |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 37.8 | 31.4 |
Defined Benefit Plan | Common stock. | Level 1 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 37.8 | 31.4 |
Defined Benefit Plan | U.S. government, state, and agency |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 8.3 | 6.0 |
Defined Benefit Plan | U.S. government, state, and agency | Level 2 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 8.3 | 6.0 |
Defined Benefit Plan | Corporate debt securities |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 3.8 | 4.6 |
Defined Benefit Plan | Corporate debt securities | Level 2 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 3.8 | 4.6 |
Defined Benefit Plan | Mutual funds |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 13.4 | 12.6 |
Defined Benefit Plan | Mutual funds | Level 1 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 13.4 | 12.6 |
Defined Benefit Plan | Interest bearing cash |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 0.5 | 2.1 |
Defined Benefit Plan | Interest bearing cash | Level 1 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | $ 0.5 | $ 2.1 |
Common stock. |  |  |
Employee Benefits |  |  |
Weighted-average asset allocations (as a percent) | 62.00% | 58.00% |
Debt securities |  |  |
Employee Benefits |  |  |
Weighted-average asset allocations (as a percent) | 37.00% | 38.00% |
Interest bearing cash |  |  |
Employee Benefits |  |  |
Weighted-average asset allocations (as a percent) | 1.00% | 4.00% |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee excluding NAV valuation. + References No definition available. + Details
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