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CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Common Stock Equity:    
Common stock, par value $1 per share $ 50.7 $ 48.3
Paid-in capital 1,482.7 1,325.6
Retained earnings 715.6 614.2
Accumulated other comprehensive income 6.4 3.2
Total Shareholders’ Equity 2,255.4 1,991.3
Redeemable noncontrolling interest 7.9 0.0
Long-Term Debt    
Total Principal of Long-Term Debt 1,916.5 2,012.0
Unamortized debt issuance costs (14.0) (15.2)
Unamortized discounts on long-term debt (2.4) (1.8)
Total Long-term Debt 1,900.1 1,995.0
Total Capitalization 4,163.4 3,986.3
3.92% Notes, due January 15, 2048    
Long-Term Debt    
Total Principal of Long-Term Debt 45.0 0.0
4.02% Notes, due January 15, 2058    
Long-Term Debt    
Total Principal of Long-Term Debt 30.0 0.0
Spire | 2.55% Senior Notes, due August 15, 2019    
Long-Term Debt    
Total Principal of Long-Term Debt 0.0 125.0
Spire | 2.52% Senior Notes, due September 1, 2021    
Long-Term Debt    
Total Principal of Long-Term Debt 35.0 35.0
Spire | 3.31% Notes Payable, due December 15, 2022    
Long-Term Debt    
Total Principal of Long-Term Debt 25.0 25.0
Spire | 3.54% Senior Notes, due February 27, 2024    
Long-Term Debt    
Total Principal of Long-Term Debt 150.0 150.0
Spire | 3.13% Senior Notes, due September 1, 2026    
Long-Term Debt    
Total Principal of Long-Term Debt 130.0 130.0
Spire | 3.93% Senior Notes, due March 15, 2027    
Long-Term Debt    
Total Principal of Long-Term Debt 100.0 100.0
Spire | 4.70% Senior Notes, due August 15, 2044    
Long-Term Debt    
Total Principal of Long-Term Debt 250.0 250.0
Spire Missouri    
Common Stock Equity:    
Common stock, par value $1 per share 0.1 0.1
Paid-in capital 760.3 756.1
Retained earnings 501.1 416.5
Accumulated other comprehensive income (1.6) (1.7)
Total Shareholders’ Equity 1,259.9 1,171.0
Long-Term Debt    
Total Principal of Long-Term Debt 830.0 880.0
Unamortized debt issuance costs (4.3) (4.6)
Unamortized discounts on long-term debt (1.3) (1.5)
Total Long-term Debt 824.4 873.9
Total Capitalization 2,084.3 2,044.9
Spire Missouri | 5.5% Series, due May 1, 2019    
Long-Term Debt    
Total Principal of Long-Term Debt 0.0 50.0
Spire Missouri | 3.0% Series, due March 15, 2023    
Long-Term Debt    
Total Principal of Long-Term Debt 55.0 55.0
Spire Missouri | 3.4% Series, due August 15, 2023    
Long-Term Debt    
Total Principal of Long-Term Debt 250.0 250.0
Spire Missouri | 3.4% Series, due March 15, 2028    
Long-Term Debt    
Total Principal of Long-Term Debt 45.0 45.0
Spire Missouri | 7.0% Series, due June 1, 2029    
Long-Term Debt    
Total Principal of Long-Term Debt 25.0 25.0
Spire Missouri | 7.9% Series, due September 15, 2030    
Long-Term Debt    
Total Principal of Long-Term Debt 30.0 30.0
Spire Missouri | 3.68% Series, due September 15, 2032    
Long-Term Debt    
Total Principal of Long-Term Debt 50.0 50.0
Spire Missouri | 6.0% Series, due May 1, 2034    
Long-Term Debt    
Total Principal of Long-Term Debt 100.0 100.0
Spire Missouri | 6.15% Series, due June 1, 2036    
Long-Term Debt    
Total Principal of Long-Term Debt 55.0 55.0
Spire Missouri | 4.625% Series, due August 15, 2043    
Long-Term Debt    
Total Principal of Long-Term Debt 100.0 100.0
Spire Missouri | 4.23% Series, due September 15, 2047    
Long-Term Debt    
Total Principal of Long-Term Debt 70.0 70.0
Spire Missouri | 4.38% Series, due September 15, 2057    
Long-Term Debt    
Total Principal of Long-Term Debt 50.0 50.0
Spire Alabama    
Common Stock Equity:    
Common stock, par value $1 per share, and paid-in capital 390.9 420.9
Retained earnings 417.8 446.5
Total Shareholders’ Equity 808.7 867.4
Long-Term Debt    
Total Principal of Long-Term Debt 325.0 250.0
Unamortized debt issuance costs (2.4) (2.2)
Total Long-term Debt 322.6 247.8
Total Capitalization 1,131.3 1,115.2
Spire Alabama | 5.2% Notes, due January 15, 2020    
Long-Term Debt    
Total Principal of Long-Term Debt 40.0 40.0
Spire Alabama | 3.86% Notes, due December 22, 2021    
Long-Term Debt    
Total Principal of Long-Term Debt 50.0 50.0
Spire Alabama | 3.21% Notes, due September 15, 2025    
Long-Term Debt    
Total Principal of Long-Term Debt 35.0 35.0
Spire Alabama | 5.9% Notes, due January 15, 2037    
Long-Term Debt    
Total Principal of Long-Term Debt 45.0 45.0
Spire Alabama | 4.31% Notes, due December 1, 2045    
Long-Term Debt    
Total Principal of Long-Term Debt 80.0 80.0
Spire Alabama | 3.92% Notes, due January 15, 2048    
Long-Term Debt    
Total Principal of Long-Term Debt 45.0 0.0
Spire Alabama | 4.02% Notes, due January 15, 2058    
Long-Term Debt    
Total Principal of Long-Term Debt 30.0 0.0
Other | 3.10% Note, due December 30, 2018    
Long-Term Debt    
Total Principal of Long-Term Debt 0.0 5.0
Other | 4.14% First Mortgage Bonds, due September 30, 2021    
Long-Term Debt    
Total Principal of Long-Term Debt 20.0 20.0
Other | 5.00% First Mortgage Bonds, due September 30, 2031    
Long-Term Debt    
Total Principal of Long-Term Debt 42.0 42.0
Other | Non-interest-bearing Note, due December 27, 2022    
Long-Term Debt    
Total Principal of Long-Term Debt $ 9.5 $ 0.0