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Pension and Other Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost (Credit) |
| Pension |  | Other Postretirement
Components of Net Periodic Benefit Cost (Credit) | 2023 |  | 2022 |  | 2023 |  | 2022
Millions |  |  |  |  |  |  |
Quarter Ended September 30, |  |  |  |  |  |  |
Service Cost | $1.7 |  |  | $2.1 |  |  | $0.6 |  |  | $0.8 |
Non-Service Cost Components (a) |  |  |  |  |  |  |
Interest Cost | 10.2 |  |  | 6.9 |  |  | 1.6 |  |  | 1.1 |
Expected Return on Plan Assets | (10.9) |  |  | (10.4) |  |  | (2.9) |  |  | (2.4) |
Amortization of Prior Service Credits | (0.1) |  |  | — |  |  | (1.8) |  |  | (1.8) |
Amortization of Net Loss | 1.4 |  |  | 2.8 |  |  | (0.6) |  |  | 0.1 |
Net Periodic Benefit Cost (Credit) | $2.3 |  |  | $1.4 |  |  | $(3.1) |  | $(2.2)
Nine Months Ended September 30, |  |  |  |  |  |  |
Service Cost | $4.9 |  |  | $6.9 |  |  | $1.7 |  |  | $2.3 |
Non-Service Cost Components (a) |  |  |  |  |  |  |
Interest Cost | 30.4 |  |  | 20.4 |  |  | 4.6 |  |  | 3.3 |
Expected Return on Plan Assets | (32.8) |  |  | (31.1) |  |  | (8.5) |  |  | (7.2) |
Amortization of Prior Service Credits | (0.1) |  |  | (0.1) |  |  | (5.3) |  |  | (5.6) |
Amortization of Net Loss | 4.3 |  |  | 8.6 |  |  | (1.7) |  |  | 0.3 |
Net Periodic Benefit Cost (Credit) | $6.7 |  |  | $4.7 |  |  | $(9.2) |  | $(6.9)
(a)These components of net periodic benefit cost (credit) are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.

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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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