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Accumulated Other Comprehensive Loss (Notes) | 9 Months Ended
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Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated Other Comprehensive Loss Accumulated other comprehensive loss, net of tax, is comprised of the following:
| Pension Plan Adjustments | Other Post Retirement Employee Benefit Plan Adjustments | Total
Balance at December 31, 2022 | $ | (46.5) |  | $ | 13.3 |  | $ | (33.3) |
Amounts reclassified from accumulated other comprehensive loss | — |  | (0.3) |  | (0.2) |
Balance at September 30, 2023 | $ | (46.5) |  | $ | 13.0 |  | $ | (33.5) |
Balance at December 31, 2023 | $ | (42.0) |  | $ | 11.3 |  | $ | (30.7) |
Amounts reclassified from accumulated other comprehensive loss | 0.1 |  | (0.2) |  | (0.1) |
Balance at September 30, 2024 | $ | (41.9) |  | $ | 11.1 |  | $ | (30.8) |

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