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PENSION PLANS AND RETIREMENT BENEFITS (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit (Income) Cost |
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended June 30, |  | Three Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of Net Periodic Benefit (Income) Cost | ($ in millions)
Service cost | $ | 1.2 |  |  | $ | 1.4 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest cost | 25.5 |  |  | 26.4 |  |  | 0.5 |  |  | 0.4 |
Expected return on plans’ assets | (33.8) |  |  | (32.7) |  |  | — |  |  | — |
Amortization of prior service cost | (0.2) |  |  | (0.1) |  |  | — |  |  | 0.1 |
Recognized actuarial loss | 1.8 |  |  | 0.3 |  |  | 0.3 |  |  | 0.2 |
Net periodic benefit (income) cost | $ | (5.5) |  |  | $ | (4.7) |  |  | $ | 1.0 |  |  | $ | 0.9 |
| Pension Benefits |  | Other Postretirement Benefits
| Six Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of Net Periodic Benefit (Income) Cost | ($ in millions)
Service cost | $ | 2.5 |  |  | $ | 2.8 |  |  | $ | 0.4 |  |  | $ | 0.4 |
Interest cost | 50.6 |  |  | 52.7 |  |  | 0.9 |  |  | 0.9 |
Expected return on plans’ assets | (67.7) |  |  | (65.6) |  |  | — |  |  | — |
Amortization of prior service cost | (0.3) |  |  | (0.2) |  |  | — |  |  | 0.1 |
Recognized actuarial loss | 3.3 |  |  | 0.6 |  |  | 0.5 |  |  | 0.4 |
Net periodic benefit (income) cost | $ | (11.6) |  |  | $ | (9.7) |  |  | $ | 1.8 |  |  | $ | 1.8 |

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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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