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COMMITMENTS AND CONTINGENCIES - Leases and Guarantees (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Loss Contingencies [Line Items]      
Aggregate rental expense $ 11.9 $ 14.1 $ 6.7
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum rental commitments - in fiscal year 2017 10.5    
Minimum rental commitments - due in fiscal year 2018 7.5    
Minimum rental commitments - due in fiscal year 2019 7.3    
Minimum rental commitments - due in fiscal year 2020 6.2    
Minimum rental commitments - due in fiscal year 2021 6.0    
Minimum rental commitments - due later 53.4    
Minimum rental commitments - total 90.9    
Sublease rentals 2.1 2.1 0.2
Minimum future sublease rentals to be received - fiscal year 2017 2.1    
Minimum future sublease rentals to be received - fiscal year 2018 2.1    
Minimum future sublease rentals to be received - fiscal year 2019 2.1    
Minimum future sublease rentals to be received - fiscal year 2020 0.5    
Outstanding mortgage loans incurred in connection with various real estate ventures with general partners 1.4    
Laclede Gas      
Loss Contingencies [Line Items]      
Aggregate rental expense 4.3 7.6 6.3
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum rental commitments - in fiscal year 2017 2.5    
Minimum rental commitments - due in fiscal year 2018 0.9    
Minimum rental commitments - due in fiscal year 2019 0.9    
Minimum rental commitments - due in fiscal year 2020 0.3    
Minimum rental commitments - due in fiscal year 2021 0.1    
Minimum rental commitments - due later 0.0    
Minimum rental commitments - total 4.7    
Alagasco      
Loss Contingencies [Line Items]      
Aggregate rental expense 3.7 4.0 2.0
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum rental commitments - in fiscal year 2017 3.9    
Minimum rental commitments - due in fiscal year 2018 2.5    
Minimum rental commitments - due in fiscal year 2019 2.5    
Minimum rental commitments - due in fiscal year 2020 2.1    
Minimum rental commitments - due in fiscal year 2021 2.1    
Minimum rental commitments - due later 4.9    
Minimum rental commitments - total 18.0    
Sublease rentals 2.1 $ 2.1 $ 0.2
Minimum future sublease rentals to be received - fiscal year 2017 2.1    
Minimum future sublease rentals to be received - fiscal year 2018 2.1    
Minimum future sublease rentals to be received - fiscal year 2019 2.1    
Minimum future sublease rentals to be received - fiscal year 2020 $ 0.5