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INCOME TAXES - Net Provisions for Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Federal      
Current $ 0.3 $ (4.2) $ (3.8)
Deferred 30.6 19.9 26.3
Investment tax credits (0.2) (0.2) (0.2)
State and local      
Current 0.6 (0.3) (0.4)
Deferred 1.0 2.4 4.4
Total Income Tax Expense 32.3 17.6 26.3
Laclede Gas
     
Federal      
Current (0.1) (6.6) (11.3)
Deferred 34.3 20.1 27.1
Investment tax credits (0.2) (0.2) (0.2)
State and local      
Current 0 (1.0) (1.8)
Deferred 1.5 2.3 4.6
Total Income Tax Expense $ 35.5 $ 14.6 $ 18.4