XML 60 R41.htm IDEA: XBRL DOCUMENT
v3.20.2

Regulatory Matters (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2020
Regulated Operations [Abstract] |
Schedule of Regulatory Assets and Liabilities | The following regulatory assets and regulatory liabilities were reflected in the Balance Sheets as of September 30, 2020 and 2019.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
September 30 |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Regulatory Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement benefit costs |  | $ | 30.6 |  |  | $ | 30.1 |  |  | $ | 21.9 |  |  | $ | 21.9 |  |  | $ | 7.7 |  |  | $ | 7.3 |
Unamortized purchased gas adjustments |  |  | 5.5 |  |  |  | 18.2 |  |  |  | — |  |  |  | — |  |  |  | 5.5 |  |  |  | 17.7 |
Other |  |  | 33.4 |  |  |  | 30.3 |  |  |  | 10.2 |  |  |  | 7.5 |  |  |  | 7.2 |  |  |  | 8.9 |
Total Current Regulatory Assets |  |  | 69.5 |  |  |  | 78.6 |  |  |  | 32.1 |  |  |  | 29.4 |  |  |  | 20.4 |  |  |  | 33.9 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future income taxes due from customers |  |  | 123.5 |  |  |  | 111.0 |  |  |  | 114.6 |  |  |  | 102.9 |  |  |  | 2.2 |  |  |  | 2.2 |
Pension and postretirement benefit costs |  |  | 439.3 |  |  |  | 416.6 |  |  |  | 332.6 |  |  |  | 333.3 |  |  |  | 98.2 |  |  |  | 77.2 |
Cost of removal |  |  | 395.6 |  |  |  | 150.9 |  |  |  | 7.1 |  |  |  | — |  |  |  | 388.6 |  |  |  | 150.9 |
Unamortized purchased gas adjustments |  |  | 12.1 |  |  |  | 9.1 |  |  |  | 12.1 |  |  |  | 9.1 |  |  |  | — |  |  |  | — |
Energy efficiency |  |  | 39.6 |  |  |  | 35.0 |  |  |  | 39.6 |  |  |  | 35.0 |  |  |  | — |  |  |  | — |
Other |  |  | 59.3 |  |  |  | 45.0 |  |  |  | 42.7 |  |  |  | 27.2 |  |  |  | 0.9 |  |  |  | 0.9 |
Total Noncurrent Regulatory Assets |  |  | 1,069.4 |  |  |  | 767.6 |  |  |  | 548.7 |  |  |  | 507.5 |  |  |  | 489.9 |  |  |  | 231.2 |
Total Regulatory Assets |  | $ | 1,138.9 |  |  | $ | 846.2 |  |  | $ | 580.8 |  |  | $ | 536.9 |  |  | $ | 510.3 |  |  | $ | 265.1 |
Regulatory Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement benefit costs |  | $ | 5.8 |  |  | $ | 5.8 |  |  | $ | 3.6 |  |  | $ | 3.6 |  |  | $ | 2.2 |  |  | $ | 2.2 |
Unamortized purchased gas adjustments |  |  | 73.1 |  |  |  | 26.2 |  |  |  | 72.3 |  |  |  | 25.4 |  |  |  | — |  |  |  | — |
Other |  |  | 34.1 |  |  |  | 28.8 |  |  |  | 27.3 |  |  |  | 23.3 |  |  |  | 1.7 |  |  |  | 1.2 |
Total Current Regulatory Liabilities |  |  | 113.0 |  |  |  | 60.8 |  |  |  | 103.2 |  |  |  | 52.3 |  |  |  | 3.9 |  |  |  | 3.4 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes due to customers |  |  | 138.8 |  |  |  | 179.8 |  |  |  | 121.4 |  |  |  | 162.5 |  |  |  | — |  |  |  | — |
Pension and postretirement benefit costs |  |  | 157.6 |  |  |  | 142.3 |  |  |  | 140.4 |  |  |  | 119.1 |  |  |  | 14.8 |  |  |  | 19.1 |
Accrued cost of removal |  |  | 28.6 |  |  |  | 41.6 |  |  |  | — |  |  |  | 15.7 |  |  |  | — |  |  |  | — |
Unamortized purchased gas adjustments |  |  | 4.4 |  |  |  | — |  |  |  | 4.4 |  |  |  | — |  |  |  | — |  |  |  | — |
Other |  |  | 14.3 |  |  |  | 35.3 |  |  |  | 8.6 |  |  |  | 29.2 |  |  |  | 3.7 |  |  |  | 3.9 |
Total Noncurrent Regulatory Liabilities |  |  | 343.7 |  |  |  | 399.0 |  |  |  | 274.8 |  |  |  | 326.5 |  |  |  | 18.5 |  |  |  | 23.0 |
Total Regulatory Liabilities |  | $ | 456.7 |  |  | $ | 459.8 |  |  | $ | 378.0 |  |  | $ | 378.8 |  |  | $ | 22.4 |  |  | $ | 26.4 |
Schedule of Regulatory Assets Not Earning a Return | A portion of the Company’s regulatory assets are not earning a return and are shown in the schedule below:
|  | Spire |  |  | Spire Missouri |
September 30 |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Pension and postretirement benefit costs |  | $ | 232.3 |  |  | $ | 211.1 |  |  | $ | 232.3 |  |  | $ | 211.1 |
Future income taxes due from customers |  |  | 121.3 |  |  |  | 108.8 |  |  |  | 114.6 |  |  |  | 102.9 |
Other |  |  | 12.9 |  |  |  | 14.3 |  |  |  | 12.9 |  |  |  | 14.3 |
Total Regulatory Assets Not Earning a Return |  | $ | 366.5 |  |  | $ | 334.2 |  |  | $ | 359.8 |  |  | $ | 328.3 |

X
- Definition Schedule of regulatory assets and liabilities. + References No definition available. + Details
Name: | sr_ScheduleOfRegulatoryAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | sr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of regulatory assets not earning a return. + References No definition available. + Details
Name: | sr_ScheduleOfRegulatoryAssetsNotEarningReturnTableTextBlock
Namespace Prefix: | sr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RegulatedOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration