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Employee Benefits - Plan Assets and Investment Policy (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Employee Benefits |  |  |
Weighted-average asset allocations (as a percent) | 100.00% | 100.00% |
Defined Benefit Plans |  |  |
Employee Benefits |  |  |
Total investments at fair value | $ 56.7 | $ 70.9 | $ 63.9
Defined Benefit Plans | Level 1 |  |  |
Employee Benefits |  |  |
Total investments at fair value | 46.1 | 60.9 |
Defined Benefit Plans | Level 2 |  |  |
Employee Benefits |  |  |
Total investments at fair value | 10.6 | 10.0 |
Defined Benefit Plans | Common stock. |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 31.4 | 39.0 |
Defined Benefit Plans | Common stock. | Level 1 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 31.4 | 39.0 |
Defined Benefit Plans | U.S. government, state, and agency |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 6.0 | 5.1 |
Defined Benefit Plans | U.S. government, state, and agency | Level 2 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 6.0 | 5.1 |
Defined Benefit Plans | Corporate debt securities |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 4.6 | 4.9 |
Defined Benefit Plans | Corporate debt securities | Level 2 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 4.6 | 4.9 |
Defined Benefit Plans | Mutual funds |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 12.6 | 20.6 |
Defined Benefit Plans | Mutual funds | Level 1 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 12.6 | 20.6 |
Defined Benefit Plans | Interest bearing cash |  |  |
Employee Benefits |  |  |
Fair value of plan assets | 2.1 | 1.3 |
Defined Benefit Plans | Interest bearing cash | Level 1 |  |  |
Employee Benefits |  |  |
Fair value of plan assets | $ 2.1 | $ 1.3 |
Common stock. |  |  |
Employee Benefits |  |  |
Weighted-average asset allocations (as a percent) | 58.00% | 66.00% |
Debt securities |  |  |
Employee Benefits |  |  |
Weighted-average asset allocations (as a percent) | 38.00% | 32.00% |
Interest bearing cash |  |  |
Employee Benefits |  |  |
Weighted-average asset allocations (as a percent) | 4.00% | 2.00% |

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