SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Gross Receipts Taxes (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Mar. 31, 2015
|
Mar. 31, 2014
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
Schedule of Gross Receipts Taxes [Line Items] | ||||
Gross Receipts taxes recorded in regulated gas distribution operating revenues | $ 44.7 | $ 34.3 | $ 72.4 | $ 54.3 |
Laclede Gas | ||||
Schedule of Gross Receipts Taxes [Line Items] | ||||
Gross Receipts taxes recorded in regulated gas distribution operating revenues | 33.9 | 34.3 | 55.8 | 54.3 |
Alagasco | ||||
Schedule of Gross Receipts Taxes [Line Items] | ||||
Gross Receipts taxes recorded in regulated gas distribution operating revenues | $ 10.8 | $ 13.0 | $ 16.6 | $ 19.4 |