CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 136.9	$ 84.6	$ 52.8
Cash flow hedging derivative instruments:
Net hedging gain (losses) arising during the period	(5.5)	(4.5)	5.0
Reclassification adjustment for losses included in net income	4.4	2.5	0.3
Net unrealized gains (losses) on cash flow hedging derivative instruments	(1.1)	(2.0)	5.3
Defined benefit pension and other postretirement benefit plans:
Net actuarial gain (losses) arising during the period	0.1	0.0	(0.1)
Amortization of actuarial loss included in net periodic pension and postretirement benefit cost	0.4	0.5	0.2
Net defined benefit pension and other postretirement benefit plans	0.5	0.5	0.1
Other Comprehensive Income (Loss), Before Tax	(0.6)	(1.5)	5.4
Income Tax Expense (Benefit) Related to Items of Other Comprehensive Income (Loss)	(0.3)	(0.6)	2.1
Other Comprehensive Income (Loss), Net of Tax	(0.3)	(0.9)	3.3
Comprehensive Income	136.6	83.7	56.1
Laclede Gas
Net income	105.3	90.1	48.8
Cash flow hedging derivative instruments:
Net hedging gain (losses) arising during the period	(1.2)	0.1	0.1
Reclassification adjustment for losses included in net income	0.9	(0.2)	(0.2)
Net unrealized gains (losses) on cash flow hedging derivative instruments	(0.3)	(0.1)	(0.1)
Defined benefit pension and other postretirement benefit plans:
Net actuarial gain (losses) arising during the period	0.1	0.0	(0.1)
Amortization of actuarial loss included in net periodic pension and postretirement benefit cost	0.4	0.4	0.2
Net defined benefit pension and other postretirement benefit plans	0.5	0.4	0.1
Other Comprehensive Income (Loss), Before Tax	0.2	0.3	0.0
Income Tax Expense (Benefit) Related to Items of Other Comprehensive Income (Loss)	0.0	0.1	0.0
Other Comprehensive Income (Loss), Net of Tax	0.2	0.2	0.0
Comprehensive Income	$ 105.5	$ 90.3	$ 48.8