CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Income	$ 25.9	$ 21.7	$ 240.1	$ 174.9
Cash flow hedging derivative instruments:
Net hedging gains (losses) arising during the period	0.6	(1.0)	2.5	11.5
Reclassification adjustment for (gains) losses included in net income	(0.3)	0.0	(1.1)	0.1
Net unrealized gains (losses) on cash flow hedging derivative instruments	0.3	(1.0)	1.4	11.6
Net gains on defined benefit pension and other postretirement plans	0.0	0.1	0.1	0.2
Net unrealized losses on available for sale securities	0.0	0.0	(0.1)	(0.1)
Other Comprehensive Income (Loss), Before Tax	0.3	(0.9)	1.4	11.7
Income Tax (Benefit) Expense Related to Items of Other Comprehensive Income	0.0	(0.4)	0.2	4.3
Other Comprehensive Income (Loss), Net of Tax	0.3	(0.5)	1.2	7.4
Comprehensive Income	26.2	21.2	241.3	182.3
Spire Missouri
Net Income	11.5	15.5	139.3	110.5
Cash flow hedging derivative instruments:
Other Comprehensive Income (Loss), Net of Tax	0.1	0.0	0.0	0.0
Comprehensive Income	$ 11.6	$ 15.5	$ 139.3	$ 110.5