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PENSION PLANS AND RETIREMENT BENEFITS (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit (Income) Cost |
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended September 30, |  | Three Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Components of Net Periodic Benefit (Income) Cost | ($ in millions)
Service cost | $ | 3.3 |  |  | $ | 2.4 |  |  | $ | 0.3 |  |  | $ | 0.3 |
Interest cost | 21.5 |  |  | 21.8 |  |  | 0.3 |  |  | 0.3 |
Expected return on plans’ assets | (36.5 | ) |  | (37.3 | ) |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | (0.6 | )
Recognized actuarial loss | 8.6 |  |  | 6.8 |  |  | 0.6 |  |  | 0.6 |
Net periodic benefit (income) cost | $ | (3.1 | ) |  | $ | (6.3 | ) |  | $ | 1.2 |  |  | $ | 0.6 |
| Pension Benefits |  | Other Postretirement Benefits
| Nine Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Components of Net Periodic Benefit (Income) Cost | ($ in millions)
Service cost | $ | 8.5 |  |  | $ | 6.9 |  |  | $ | 1.0 |  |  | $ | 0.9 |
Interest cost | 64.8 |  |  | 65.0 |  |  | 1.1 |  |  | 1.1 |
Expected return on plans’ assets | (109.9 | ) |  | (111.8 | ) |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | (1.9 | )
Recognized actuarial loss | 25.9 |  |  | 20.2 |  |  | 1.8 |  |  | 1.9 |
Net periodic benefit (income) cost | $ | (10.7 | ) |  | $ | (19.7 | ) |  | $ | 3.9 |  |  | $ | 2.0 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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