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SUBSEQUENT EVENTS	3 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2014
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On December 15, 2014, Alagasco gave notice of its intent to redeem all $34.8 of its 5.7% notes due 2035. The redemption was completed on January 15, 2015. On January 22, 2015, Alagasco filed a request to enter into interest rate derivative instruments related to its previous approval on November 3, 2014, to issue and sell $35.0 principal amount of debt. The APSC approved the request by order dated February 3, 2015. On January 22, 2015, Alagasco filed a request with the APSC for authority to issue $80.0 in debt, in preparation for refinancing the scheduled maturity on December 1, 2015, of $80.0 of existing debt. Further, such request sought authority to enter into interest rate derivative instruments related to the proposed debt issuance. The APSC approved the request by order dated February 3, 2015.