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COMMITMENTS AND CONTINGENCIES - Contingencies (Details)
72 Months Ended
Dec. 17, 2013
fatality
Mar. 31, 2018
lawsuit
plaintiff
Jun. 30, 2018
site
Sep. 30, 2013
site
Spire Gulf        
Loss Contingencies [Line Items]        
Number of lawsuits filed | lawsuit   14    
Number of plaintiffs | plaintiff   1,600    
Spire Missouri        
Loss Contingencies [Line Items]        
Number of former manufactured gas plant (MGP) sites in Missouri     3  
Number of former manufactured gas plant (MGP) sites enrolled in BVCP     2  
Spire Alabama        
Loss Contingencies [Line Items]        
Number of former manufactured gas plant (MGP)     9  
Number of incident fatalities | fatality 1      
Number of former manufactured gas distribution     5  
Previous Ownership | Spire Missouri        
Loss Contingencies [Line Items]        
Number of former manufactured gas plant (MGP)       19
Previous Ownership | Missouri Gas Energy (MGE)        
Loss Contingencies [Line Items]        
Number of former manufactured gas plant (MGP)     7  
Current Ownership | Spire Alabama        
Loss Contingencies [Line Items]        
Number of former manufactured gas plant (MGP)     4  
Number of former manufactured gas distribution     1  
Pending Litigation | Spire Gulf        
Loss Contingencies [Line Items]        
Number of plaintiffs | plaintiff   27