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CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Common Stock Equity:    
Common stock, par value $1 per share $ 45.6 $ 43.3
Paid-in capital 1,175.9 1,038.1
Retained earnings 550.9 494.2
Accumulated other comprehensive loss (4.2) (2.0)
Total Common Stock Equity 1,768.2 1,573.6
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 1,835.8 1,773.8
Unamortized discounts on long-term debt (2.1) (2.3)
Total Long-Term Debt 1,833.7 1,771.5
Total Capitalization 3,601.9 3,345.1
Spire | Floating Rate Senior Notes, due August 15, 2017    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 0.0 250.0
Spire | 2.55% Senior Notes, due August 15, 2019    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 125.0 125.0
Spire | 2.52% Senior Notes, due September 1, 2021    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 35.0 0.0
Spire | 2.0% Series A Remarketable Subordinated Notes, due April 1, 2022    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 143.8 143.8
Spire | 3.31% Notes Payable, due December 15, 2022    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 25.0 25.0
Spire | 3.13% Senior Notes, due September 1, 2026    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 130.0 0.0
Spire | 4.70% Senior Notes, due August 15, 2044    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 250.0 250.0
Laclede Gas    
Common Stock Equity:    
Common stock, par value $1 per share 0.1 0.1
Paid-in capital 751.9 748.2
Retained earnings 318.3 291.2
Accumulated other comprehensive loss (1.8) (1.7)
Total Common Stock Equity 1,068.5 1,037.8
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 810.0 810.0
Unamortized discounts on long-term debt (1.7) (1.9)
Total Long-Term Debt 808.3 808.1
Total Capitalization 1,876.8 1,845.9
Laclede Gas | 2.0% Series, due August 15, 2018    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 100.0 100.0
Laclede Gas | 5.5% Series, due May 1, 2019    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 50.0 50.0
Laclede Gas | 3.0% Series, due March 15, 2023    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 55.0 55.0
Laclede Gas | 3.4% Series, due August 15, 2023    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 250.0 250.0
Laclede Gas | 3.4% Series, due March 15, 2028    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 45.0 45.0
Laclede Gas | 7.0% Series, due June 1, 2029    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 25.0 25.0
Laclede Gas | 7.9% Series, due September 15, 2030    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 30.0 30.0
Laclede Gas | 6.0% Series, due May 1, 2034    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 100.0 100.0
Laclede Gas | 6.15% Series, due June 1, 2036    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 55.0 55.0
Laclede Gas | 4.625% Series, due August 15, 2043    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 100.0 100.0
Alagasco    
Common Stock Equity:    
Common stock, par value $1 per share, and paid-in capital 451.9 480.9
Retained earnings 415.4 393.7
Total Common Stock Equity 867.3 874.6
Long-Term Debt - Laclede Gas:    
Total Long-Term Debt 250.0 170.0
Total Capitalization 1,117.3 1,044.6
Alagasco | 5.2% Notes, due January 15, 2020    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 40.0 40.0
Alagasco | 3.86% Notes, due December 23, 2021    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 50.0 50.0
Alagasco | 3.21% Notes, due September 15, 2025    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 35.0 35.0
Alagasco | 5.9% Notes, due January 15, 2037    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 45.0 45.0
Alagasco | 4.31% Notes, due December 1, 2045    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 80.0 0.0
Other | 3.10%, due December 30, 2018    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 5.0 0.0
Other | 4.14%, due September 30, 2021    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding 20.0 0.0
Other | 5.00%, due September 30, 2031    
Long-Term Debt - Laclede Gas:    
Debt instrument, principal outstanding $ 42.0 $ 0.0