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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 67.0 48.0 13.2               67.0 48.0 13.2    
Dividend reinvestment plan 2.3             2.3              
Dividend reinvestment plan (in shares)       28,764                      
Stock-based compensation costs 1.6             1.6              
Stock issued under stock-based compensation plans       $ 0.1       (0.1)              
Stock issued under stock-based compensation (in shares)       99,126                      
Employees’ tax withholding for stock-based compensation (2.9)             (2.9)              
Employee's tax withholding for stock-based compensation (in shares)       (37,945)                      
Temporary equity adjustment to redemption value (0.1)                   (0.1)        
Dividends declared on common stock (31.9) (11.3) (6.0)               (31.9) (11.3) (6.0)    
Dividends declared on preferred stock (7.4)                   (7.4)        
Other comprehensive income (loss), net of tax 14.4 0.1                       14.4 0.1
BALANCE at Dec. 31, 2019 2,586.0 1,376.1 837.2 $ 51.1 $ 0.1   242.0 1,506.7 765.0 370.9 803.1 613.3 466.3 (16.9) (2.3)
BALANCE (in shares) at Dec. 31, 2019       51,063,460 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 88.9 56.6 13.7               88.9 56.6 13.7    
Dividend reinvestment plan 0.4             0.4              
Dividend reinvestment plan (in shares)       6,698                      
Stock-based compensation costs 1.4             1.4              
Stock issued under stock-based compensation plans       $ 0.1       (0.1)              
Stock issued under stock-based compensation (in shares)       55,161                      
Employees’ tax withholding for stock-based compensation (0.9)             (0.9)              
Employee's tax withholding for stock-based compensation (in shares)       (14,175)                      
Temporary equity adjustment to redemption value (0.9)                   (0.9)        
Return of capital to Spire     (11.0)             (11.0)          
Dividends declared on common stock (33.8)   (5.5)               (33.8)   (5.5)    
Dividends declared on preferred stock (3.7)                   (3.7)        
Other comprehensive income (loss), net of tax 13.1 0.1                       13.1 0.1
BALANCE at Dec. 31, 2020 $ 2,586.8 $ 1,491.8 $ 848.9 $ 51.7 $ 0.1   $ 242.0 $ 1,550.0 $ 765.0 $ 339.9 $ 771.2 $ 729.5 $ 509.0 $ (28.1) $ (2.8)
BALANCE (in shares) at Dec. 31, 2020       51,659,473 24,577 1,972,052                  
[1] Accumulated other comprehensive income (loss)