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Pension Plans and Other Postretirement Benefits (Tables) | 6 Months Ended
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Mar. 31, 2021
Pension Plans |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net periodic cost | The net periodic pension cost includes components shown in the following tables. The components other than the service costs and regulatory adjustment are presented in “Other Income (Expense), Net” in the income statement, except for Spire Alabama’s losses on lump-sum settlements. Such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income (Expense), Net.”
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Spire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost – benefits earned during the period |  | $ | 5.3 |  |  | $ | 5.6 |  |  | $ | 10.9 |  |  | $ | 11.1 |
Interest cost on projected benefit obligation |  |  | 4.6 |  |  |  | 5.8 |  |  |  | 9.8 |  |  |  | 11.7 |
Expected return on plan assets |  |  | (7.1 | ) |  |  | (9.0 | ) |  |  | (15.1 | ) |  |  | (18.2 | )
Amortization of prior service credit |  |  | (0.7 | ) |  |  | (0.6 | ) |  |  | (1.5 | ) |  |  | (1.2 | )
Amortization of actuarial loss |  |  | 3.8 |  |  |  | 3.9 |  |  |  | 7.8 |  |  |  | 7.6 |
Loss on lump-sum settlements |  |  | 3.8 |  |  |  | 21.0 |  |  |  | 3.8 |  |  |  | 21.0 |
Subtotal |  |  | 9.7 |  |  |  | 26.7 |  |  |  | 15.7 |  |  |  | 32.0 |
Regulatory adjustment |  |  | 5.2 |  |  |  | (11.3 | ) |  |  | 14.8 |  |  |  | (1.7 | )
Net pension cost |  | $ | 14.9 |  |  | $ | 15.4 |  |  | $ | 30.5 |  |  | $ | 30.3 |
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost – benefits earned during the period |  | $ | 3.9 |  |  | $ | 3.9 |  |  | $ | 7.8 |  |  | $ | 7.7 |
Interest cost on projected benefit obligation |  |  | 3.5 |  |  |  | 4.0 |  |  |  | 7.0 |  |  |  | 8.2 |
Expected return on plan assets |  |  | (5.6 | ) |  |  | (6.3 | ) |  |  | (11.2 | ) |  |  | (12.9 | )
Amortization of prior service (credit) cost |  |  | (0.1 | ) |  |  | 0.1 |  |  |  | (0.3 | ) |  |  | 0.1 |
Amortization of actuarial loss |  |  | 2.8 |  |  |  | 3.1 |  |  |  | 5.7 |  |  |  | 6.0 |
Loss on lump-sum settlements |  |  | — |  |  |  | 21.0 |  |  |  | — |  |  |  | 21.0 |
Subtotal |  |  | 4.5 |  |  |  | 25.8 |  |  |  | 9.0 |  |  |  | 30.1 |
Regulatory adjustment |  |  | 7.5 |  |  |  | (13.2 | ) |  |  | 15.1 |  |  |  | (5.5 | )
Net pension cost |  | $ | 12.0 |  |  | $ | 12.6 |  |  | $ | 24.1 |  |  | $ | 24.6 |
Spire Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost – benefits earned during the period |  | $ | 1.4 |  |  | $ | 1.5 |  |  | $ | 2.9 |  |  | $ | 3.0 |
Interest cost on projected benefit obligation |  |  | 1.2 |  |  |  | 1.3 |  |  |  | 2.4 |  |  |  | 2.5 |
Expected return on plan assets |  |  | (1.5 | ) |  |  | (1.8 | ) |  |  | (3.1 | ) |  |  | (3.5 | )
Amortization of prior service credit |  |  | (0.6 | ) |  |  | (0.6 | ) |  |  | (1.2 | ) |  |  | (1.2 | )
Amortization of actuarial loss |  |  | 1.0 |  |  |  | 0.8 |  |  |  | 2.1 |  |  |  | 1.6 |
Loss on lump-sum settlements |  |  | 3.8 |  |  |  | — |  |  |  | 3.8 |  |  |  | — |
Subtotal |  |  | 5.3 |  |  |  | 1.2 |  |  |  | 6.9 |  |  |  | 2.4 |
Regulatory adjustment |  |  | (2.5 | ) |  |  | 1.7 |  |  |  | (0.7 | ) |  |  | 3.4 |
Net pension cost |  | $ | 2.8 |  |  | $ | 2.9 |  |  | $ | 6.2 |  |  | $ | 5.8 |
Other Postretirement Plans |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net periodic cost | The net periodic postretirement benefit cost includes components shown in the following tables. The components other than the service costs and regulatory adjustment are presented in “Other Income (Expense), Net” in the income statement, except in the event Spire Alabama incurs losses on lump-sum settlements. Any such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income (Expense), Net.”
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Spire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost – benefits earned during the period |  | $ | 1.9 |  |  | $ | 1.5 |  |  | $ | 3.7 |  |  | $ | 2.9 |
Interest cost on accumulated postretirement benefit obligation |  |  | 1.6 |  |  |  | 1.5 |  |  |  | 3.0 |  |  |  | 3.1 |
Expected return on plan assets |  |  | (4.1 | ) |  |  | (4.1 | ) |  |  | (8.1 | ) |  |  | (8.2 | )
Amortization of prior service cost (credit) |  |  | 0.2 |  |  |  | (0.1 | ) |  |  | 0.5 |  |  |  | (0.3 | )
Amortization of actuarial gain |  |  | (0.4 | ) |  |  | (0.5 | ) |  |  | (0.8 | ) |  |  | (1.0 | )
Subtotal |  |  | (0.8 | ) |  |  | (1.7 | ) |  |  | (1.7 | ) |  |  | (3.5 | )
Regulatory adjustment |  |  | 3.2 |  |  |  | 4.0 |  |  |  | 6.6 |  |  |  | 8.0 |
Net postretirement benefit cost |  | $ | 2.4 |  |  | $ | 2.3 |  |  | $ | 4.9 |  |  | $ | 4.5 |
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost – benefits earned during the period |  | $ | 1.5 |  |  | $ | 1.3 |  |  | $ | 3.1 |  |  | $ | 2.6 |
Interest cost on accumulated postretirement benefit obligation |  |  | 1.1 |  |  |  | 1.1 |  |  |  | 2.2 |  |  |  | 2.3 |
Expected return on plan assets |  |  | (2.8 | ) |  |  | (2.9 | ) |  |  | (5.5 | ) |  |  | (5.7 | )
Amortization of prior service cost (credit) |  |  | 0.2 |  |  |  | — |  |  |  | 0.4 |  |  |  | (0.1 | )
Amortization of actuarial gain |  |  | (0.3 | ) |  |  | (0.5 | ) |  |  | (0.7 | ) |  |  | (1.0 | )
Subtotal |  |  | (0.3 | ) |  |  | (1.0 | ) |  |  | (0.5 | ) |  |  | (1.9 | )
Regulatory adjustment |  |  | 3.7 |  |  |  | 4.5 |  |  |  | 7.5 |  |  |  | 8.9 |
Net postretirement benefit cost |  | $ | 3.4 |  |  | $ | 3.5 |  |  | $ | 7.0 |  |  | $ | 7.0 |
Spire Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost – benefits earned during the period |  | $ | 0.3 |  |  | $ | 0.1 |  |  | $ | 0.5 |  |  | $ | 0.2 |
Interest cost on accumulated postretirement benefit obligation |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.7 |  |  |  | 0.7 |
Expected return on plan assets |  |  | (1.3 | ) |  |  | (1.2 | ) |  |  | (2.5 | ) |  |  | (2.4 | )
Amortization of prior service (credit) cost |  |  | — |  |  |  | (0.1 | ) |  |  | 0.1 |  |  |  | (0.2 | )
Subtotal |  |  | (0.6 | ) |  |  | (0.8 | ) |  |  | (1.2 | ) |  |  | (1.7 | )
Regulatory adjustment |  |  | (0.5 | ) |  |  | (0.5 | ) |  |  | (0.9 | ) |  |  | (0.9 | )
Net postretirement benefit income |  | $ | (1.1 | ) |  | $ | (1.3 | ) |  | $ | (2.1 | ) |  | $ | (2.6 | )

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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