ACQUISITION (Details) (USD $)	0 Months Ended
	Sep. 02, 2014	Sep. 02, 2014
Business Acquisition [Line Items]
Deferred tax asset established	$ 280,100,000	$ 280,100,000
Deferred tax assets and liabilities	0	0
Laclede Group Inc | Alagasco
Business Acquisition [Line Items]
Total consideration transferred	1,600,000,000
Long-term debt assumed in a business combination		$ 250,000,000