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Long-term Debt (Tables) | 12 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Composition of Long-term Debt | The composition of long-term debt as of September 30 is shown in the following tables.
|  | 2020 |  |  | 2019 |
Spire |  |  |  |  |  |  |  |
2.52% Senior Notes, due September 1, 2021 |  | $ | 35.0 |  |  | $ | 35.0 |
3.31% Notes Payable, due December 15, 2022 |  |  | 25.0 |  |  |  | 25.0 |
3.54% Senior Notes, due February 27, 2024 |  |  | 150.0 |  |  |  | 150.0 |
3.13% Senior Notes, due September 1, 2026 |  |  | 130.0 |  |  |  | 130.0 |
3.93% Senior Notes, due March 15, 2027 |  |  | 100.0 |  |  |  | 100.0 |
4.70% Senior Notes, due August 15, 2044 |  |  | 250.0 |  |  |  | 250.0 |
Total principal of Spire Missouri long-term debt (see below) |  |  | 1,098.0 |  |  |  | 930.0 |
Total principal of Spire Alabama long-term debt (see below) |  |  | 475.0 |  |  |  | 415.0 |
Other subsidiaries' long-term debt: |  |  |  |  |  |  |  |
4.14% First Mortgage Bonds, due September 30, 2021 |  |  | 20.0 |  |  |  | 20.0 |
5.00% First Mortgage Bonds, due September 30, 2031 |  |  | 42.0 |  |  |  | 42.0 |
2.95% Notes, with annual principal payments through December 2034 |  |  | 135.0 |  |  |  | — |
3.52% First Mortgage Bonds, due September 30, 2049 |  |  | 40.0 |  |  |  | 40.0 |
Total principal of long-term debt |  |  | 2,500.0 |  |  |  | 2,137.0 |
Less: Unamortized discounts and debt issuance costs |  |  | (15.9 | ) |  |  | (14.4 | )
Less: Current portion |  |  | (60.4 | ) |  |  | (40.0 | )
Long-term debt, excluding current portion |  | $ | 2,423.7 |  |  | $ | 2,082.6 |
Spire Missouri |  |  |  |  |  |  |  |
Floating-rate note due December 1, 2021 |  | $ | — |  |  | $ | 100.0 |
First Mortgage Bonds: |  |  |  |  |  |  |  |
3.00% Series, due March 15, 2023 |  |  | 55.0 |  |  |  | 55.0 |
3.40% Series, due August 15, 2023 |  |  | 250.0 |  |  |  | 250.0 |
3.40% Series, due March 15, 2028 |  |  | 45.0 |  |  |  | 45.0 |
7.00% Series, due June 1, 2029 |  |  | 19.3 |  |  |  | 25.0 |
2.84% Series, due November 15, 2029 |  |  | 275.0 |  |  |  | — |
7.90% Series, due September 15, 2030 |  |  | 30.0 |  |  |  | 30.0 |
3.68% Series, due September 15, 2032 |  |  | 50.0 |  |  |  | 50.0 |
6.00% Series, due May 1, 2034 |  |  | 99.3 |  |  |  | 100.0 |
6.15% Series, due June 1, 2036 |  |  | 54.5 |  |  |  | 55.0 |
4.63% Series, due August 15, 2043 |  |  | 99.9 |  |  |  | 100.0 |
4.23% Series, due September 15, 2047 |  |  | 70.0 |  |  |  | 70.0 |
4.38% Series, due September 15, 2057 |  |  | 50.0 |  |  |  | 50.0 |
Total principal of Spire Missouri long-term debt |  |  | 1,098.0 |  |  |  | 930.0 |
Less: Unamortized discounts and debt issuance costs |  |  | (6.0 | ) |  |  | (5.0 | )
Less: Current portion |  |  | — |  |  |  | — |
Spire Missouri long-term debt, excluding current portion |  | $ | 1,092.0 |  |  | $ | 925.0 |
Spire Alabama |  |  |  |  |  |  |  |
5.20% Notes, due January 15, 2020 |  | $ | — |  |  | $ | 40.0 |
3.86% Notes, due December 22, 2021 |  |  | 50.0 |  |  |  | 50.0 |
3.21% Notes, due September 15, 2025 |  |  | 35.0 |  |  |  | 35.0 |
2.88% Notes, due December 1, 2029 |  |  | 100.0 |  |  |  | — |
5.90% Notes, due January 15, 2037 |  |  | 45.0 |  |  |  | 45.0 |
4.31% Notes, due December 1, 2045 |  |  | 80.0 |  |  |  | 80.0 |
3.92% Notes, due January 15, 2048 |  |  | 45.0 |  |  |  | 45.0 |
4.64% Notes, due January 15, 2049 |  |  | 90.0 |  |  |  | 90.0 |
4.02% Notes, due January 15, 2058 |  |  | 30.0 |  |  |  | 30.0 |
Total principal of Spire Alabama long-term debt |  |  | 475.0 |  |  |  | 415.0 |
Less: Unamortized discounts and debt issuance costs |  |  | (3.2 | ) |  |  | (2.8 | )
Less: Current portion |  |  | — |  |  |  | (40.0 | )
Spire Alabama long-term debt, excluding current portion |  | $ | 471.8 |  |  | $ | 372.2 |
Schedule of Maturities of Long-term Debt | Maturities of long-term debt for Spire on a consolidated basis, Spire Missouri and Spire Alabama for the five fiscal years after September 30, 2020 are as follows:
|  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |
Spire |  | $ | 60.4 |  |  | $ | 55.8 |  |  | $ | 336.2 |  |  | $ | 156.6 |  |  | $ | 42.0 |
Spire Missouri |  |  | — |  |  |  | — |  |  |  | 305.0 |  |  |  | — |  |  |  | — |
Spire Alabama |  |  | — |  |  |  | 50.0 |  |  |  | — |  |  |  | — |  |  |  | 35.0 |

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