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Retirement Plans and Postretirement Benefits - (Tables) | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Cost of Pension and Other Postretirement Employee Benefit Plans |
| Quarter Ended June 30, |  | Six Months Ended June 30,
Pension Benefit Plans | 2025 | 2024 |  | 2025 | 2024
Service cost | $ | 0.8 |  | $ | 0.6 |  |  | $ | 1.5 |  | $ | 1.3 |
Interest cost | 3.0 |  | 3.0 |  |  | 5.9 |  | 5.9 |
Expected return on plan assets | (3.3) |  | (3.9) |  |  | (6.7) |  | (7.9) |
Amortization of actuarial loss | 0.2 |  | — |  |  | 0.4 |  | 0.1 |
Net periodic cost | $ | 0.6 |  | $ | (0.3) |  |  | $ | 1.2 |  | $ | (0.6) |
| Quarter Ended June 30, |  | Six Months Ended June 30,
Other Postretirement Employee Benefit Plans | 2025 | 2024 |  | 2025 | 2024
Service cost | $ | — |  | $ | 0.1 |  |  | $ | 0.1 |  | $ | 0.1 |
Interest cost | 0.6 |  | 0.7 |  |  | 1.2 |  | 1.3 |
Amortization of actuarial gain | (0.1) |  | (0.1) |  |  | (0.3) |  | (0.1) |
Net periodic cost | $ | 0.5 |  | $ | 0.6 |  |  | $ | 1.0 |  | $ | 1.3 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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