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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inter-company Transactions (Details) (Affiliated Entity, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Regulated Operation \| Laclede Gas \| Laclede Energy Resources
Related Party Transaction [Line Items]
Revenue from related parties	$ 16.0	$ 25.0	$ 41.3	$ 44.5
Regulated Operation \| Laclede Energy Resources \| Laclede Gas
Related Party Transaction [Line Items]
Revenue from related parties	1.9	4.2	2.9	4.3
Unregulated Operation \| Laclede Gas \| Laclede Pipeline Company
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.2	$ 0.2	$ 0.5	$ 0.5

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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