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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Net Benefit (Credits) Costs [Table Text Block] | The components of net periodic benefit cost (credit) are as follows:
|  | Pension Benefits
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
|  | (in millions)
Service cost |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.8 |  |  | $ | 0.8 |
Interest cost |  | 5.8 |  |  | 6.1 |  |  | 17.4 |  |  | 18.2 |
Expected asset return |  | (7.2) |  |  | (7.3) |  |  | (21.5) |  |  | (21.8) |
Amortized loss |  | 1.7 |  |  | 1.0 |  |  | 5.1 |  |  | 3.1 |
Net periodic benefit cost |  | $ | 0.6 |  |  | $ | 0.1 |  |  | $ | 1.8 |  |  | $ | 0.3 |
|  | Other Postretirement Benefits
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
|  | (in millions)
Service cost |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  | 2.1 |  |  | 2.6 |  |  | 6.3 |  |  | 7.6 |
Amortized gain |  | (2.5) |  |  | (2.1) |  |  | (7.5) |  |  | (6.3) |
Amortized prior service credit |  | (0.1) |  |  | (0.2) |  |  | (0.3) |  |  | (0.4) |
Net periodic benefit cost (credit) |  | $ | (0.5) |  |  | $ | 0.3 |  |  | $ | (1.4) |  |  | $ | 1.0 |

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- References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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