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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Millions
Total
Spire Missouri
Spire Alabama
Common Stock
Common Stock
Spire Missouri
Common Stock
Spire Alabama
Preferred Stock
Paid-in Capital
Paid-in Capital
Spire Missouri
Paid-in Capital
Spire Alabama
Retained Earnings
Retained Earnings
Spire Missouri
Retained Earnings
Spire Alabama
AOCI
 [1]
AOCI
Spire Missouri
 [1]
BALANCE at Sep. 30, 2019 $ 2,543.0 $ 1,339.3 $ 830.0 $ 51.0 $ 0.1   $ 242.0 $ 1,505.8 $ 765.0 $ 370.9 $ 775.5 $ 576.6 $ 459.1 $ (31.3) $ (2.4)
BALANCE (in shares) at Sep. 30, 2019       50,973,515 24,577 1,972,052                  
Stockholders' Equity Rollforward                              
Net income (loss) 108.3 129.0 74.6               108.3 129.0 74.6    
Common stock issued 24.6     $ 0.3       24.3              
Common stock issued (in shares)       321,232                      
Dividend reinvestment plan 8.7     $ 0.1       8.6              
Dividend reinvestment plan (in shares)       114,851                      
Stock-based compensation costs 4.5             4.5              
Stock issued under stock-based compensation plans       $ 0.1       (0.1)              
Stock issued under stock-based compensation (in shares)       108,522                      
Employees’ tax withholding for stock-based compensation (3.2)             (3.2)              
Employee's tax withholding for stock-based compensation (in shares)       (40,288)                      
Temporary equity adjustment to redemption value 1.7                   1.7        
Return of capital to Spire     (20.0)             (20.0)          
Dividends declared on common stock (96.1) (33.9) (18.0)               (96.1) (33.9) (18.0)    
Dividends declared on preferred stock (14.8)                   (14.8)        
Other comprehensive income (loss), net of tax (18.3)                         (18.3)  
BALANCE at Jun. 30, 2020 2,558.4 1,434.4 866.6 $ 51.5 $ 0.1   242.0 1,539.9 765.0 350.9 774.6 671.7 515.7 $ (49.6) (2.4)
BALANCE (in shares) at Jun. 30, 2020       51,477,832 24,577 1,972,052                  
BALANCE at Mar. 31, 2020 2,665.6 1,439.1 869.0 $ 51.2 $ 0.1   242.0 1,520.7 765.0 350.9 902.3 676.5 518.1   (2.5)
BALANCE (in shares) at Mar. 31, 2020       51,229,061 24,577 1,972,052               (50,600,000)  
Stockholders' Equity Rollforward                              
Net income (loss) (92.3) 6.5 3.6               (92.3) 6.5 3.6    
Common stock issued 15.1     $ 0.2       14.9              
Common stock issued (in shares)       208,474                      
Dividend reinvestment plan 3.1     $ 0.1       3.0              
Dividend reinvestment plan (in shares)       40,968                      
Stock-based compensation costs 1.4             1.4              
Stock issued under stock-based compensation (in shares)       (230)                      
Employees’ tax withholding for stock-based compensation (0.1)             (0.1)              
Employee's tax withholding for stock-based compensation (in shares)       (441)                      
Temporary equity adjustment to redemption value 0.6                   0.6        
Dividends declared on common stock (32.3) (11.3) (6.0)               (32.3) (11.3) (6.0)    
Dividends declared on preferred stock (3.7)                   (3.7)        
Other comprehensive income (loss), net of tax 1.0 0.1                       $ 1.0 0.1
BALANCE at Jun. 30, 2020 2,558.4 1,434.4 866.6 $ 51.5 $ 0.1   242.0 1,539.9 765.0 350.9 774.6 671.7 515.7 (49.6) (2.4)
BALANCE (in shares) at Jun. 30, 2020       51,477,832 24,577 1,972,052                  
BALANCE at Sep. 30, 2020 2,522.3 1,435.1 851.7 $ 51.6 $ 0.1   242.0 1,549.2 765.0 350.9 720.7 672.9 500.8 (41.2) (2.9)
BALANCE (in shares) at Sep. 30, 2020       51,611,789 24,577 1,972,052                  
Stockholders' Equity Rollforward                              
Net income (loss) 281.6 152.8 83.5               281.6 152.8 83.5    
Dividend reinvestment plan 1.1             1.1              
Dividend reinvestment plan (in shares)       18,260                      
Stock-based compensation costs 5.4             5.4              
Stock issued under stock-based compensation plans       $ 0.1       (0.1)              
Stock issued under stock-based compensation (in shares)       65,234                      
Employees’ tax withholding for stock-based compensation (1.0)             (1.0)              
Employee's tax withholding for stock-based compensation (in shares)       (15,301)                      
Equity units issued (40.7)             (40.7)              
Temporary equity adjustment to redemption value (1.7)                   (1.7)        
Return of capital to Spire     (22.0)             (22.0)          
Dividends declared on common stock (101.9)   (16.5)               (101.9)   (16.5)    
Dividends declared on preferred stock (11.1)                   (11.1)        
Other comprehensive income (loss), net of tax 43.1 0.3                       43.1 0.3
BALANCE at Jun. 30, 2021 2,697.1 1,588.2 896.7 $ 51.7 $ 0.1   242.0 1,513.9 765.0 328.9 887.6 825.7 567.8 1.9 (2.6)
BALANCE (in shares) at Jun. 30, 2021       51,679,982 24,577 1,972,052                  
BALANCE at Mar. 31, 2021 2,731.3 1,585.0 895.7 $ 51.7 $ 0.1   242.0 1,512.2 765.0 328.9 920.1 822.6 566.8 5.3 (2.7)
BALANCE (in shares) at Mar. 31, 2021       51,674,256 24,577 1,972,052                  
Stockholders' Equity Rollforward                              
Net income (loss) 5.3 3.1 6.5               5.3 3.1 6.5    
Dividend reinvestment plan 0.4             0.4              
Dividend reinvestment plan (in shares)       5,715                      
Stock-based compensation costs 2.0             2.0              
Stock issued under stock-based compensation (in shares)       824                      
Employees’ tax withholding for stock-based compensation (0.1)             (0.1)              
Employee's tax withholding for stock-based compensation (in shares)       (813)                      
Equity units issued (0.6)             (0.6)              
Temporary equity adjustment to redemption value 0.4                   0.4        
Dividends declared on common stock (34.5)   (5.5)               (34.5)   (5.5)    
Dividends declared on preferred stock (3.7)                   (3.7)        
Other comprehensive income (loss), net of tax (3.4) 0.1                       (3.4) 0.1
BALANCE at Jun. 30, 2021 $ 2,697.1 $ 1,588.2 $ 896.7 $ 51.7 $ 0.1   $ 242.0 $ 1,513.9 $ 765.0 $ 328.9 $ 887.6 $ 825.7 $ 567.8 $ 1.9 $ (2.6)
BALANCE (in shares) at Jun. 30, 2021       51,679,982 24,577 1,972,052                  
[1] Accumulated other comprehensive income (loss)