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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
ASSETS      
Non-utility property, accumulated depreciation and amortization $ 22.2 $ 19.0 $ 13.9
Capitalization:      
Common stock, par value (in dollars per share) $ 1.00 $ 1.00 $ 1.00
Common stock, authorized (in shares) 70,000,000.0 70,000,000.0 70,000,000.0
Common stock, issued (in shares) 51,700,000 51,600,000 51,100,000
Common stock, outstanding (in shares) 51,700,000 51,600,000 51,100,000
Spire Missouri      
Capitalization:      
Common stock, par value (in dollars per share) $ 1.00 $ 1.00 $ 1.00
Common stock, authorized (in shares) 50,000,000.0 50,000,000.0 50,000,000.0
Common stock, issued (in shares) 24,577 24,577 24,577
Common stock, outstanding (in shares) 24,577 24,577 24,577
Spire Alabama      
Capitalization:      
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Common stock, authorized (in shares) 3,000,000.0 3,000,000.0 3,000,000.0
Common stock, issued (in shares) 2,000,000.0 2,000,000.0 2,000,000.0
Common stock, outstanding (in shares) 2,000,000.0 2,000,000.0 2,000,000.0
Depositary Shares, each representing a 1/1,000th interest in a share of 5.90% Series A Cumulative Redeemable Perpetual Preferred Stock, par value $25.00 per share      
Capitalization:      
Preferred stock, par value (in dollars per share) $ 25.00 $ 25.00 $ 25.00
Preferred stock, depositary shares authorized (in shares) 10,000,000.0 10,000,000.0 10,000,000.0
Preferred stock, depositary shares outstanding (in shares) 10,000,000.0 10,000,000.0 10,000,000.0
Preferred stock, depositary shares issued (in shares) 10,000,000.0 10,000,000.0 10,000,000.0