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Pension Plans (Tables) | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Pension Plans and Postretirement Benefit Plans |
| First Quarter |  |
| 2024 |  | 2023 |  |  |  |
Service cost — benefits earned during the period (in millions) | $ | 1.5 |  |  | $ | 1.5 |  |  |  |  |
Pension non-service cost (income) (in millions): |  |  |  |  |  |  |
Interest cost on benefit obligation | $ | 8.2 |  |  | $ | 8.4 |  |  |  |  |
Expected return on plan assets | (13.6) |  |  | (13.6) |  |  |  |  |
Amortization of net prior service cost (income) | (0.2) |  |  | (0.5) |  |  |  |  |
Amortization of net actuarial loss (gain) | 2.9 |  |  | 2.4 |  |  |  |  |
Pension non-service cost (income) | $ | (2.7) |  |  | $ | (3.3) |  |  |  |  |

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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://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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