Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Income	$ (1.4)	$ 5.3	$ 227.9	$ 281.6
Other Comprehensive Income (Loss), Before Tax:
Net hedging gain (loss) arising during the period	24.3	(4.2)	38.2	56.5
Amounts reclassified into net income	(0.2)	(0.3)	(0.9)	(1.0)
Net gain (loss) on cash flow hedging derivative instruments	24.1	(4.5)	37.3	55.5
Net gain on defined benefit pension and other postretirement plans	0.2	0.1	0.4	0.3
Net unrealized loss on available for sale securities	(0.1)	0.0	(0.3)	(0.1)
Other Comprehensive Income (Loss), Before Tax	24.2	(4.4)	37.4	55.7
Income Tax Expense (Benefit) Related to Items of Other Comprehensive Income	5.7	(1.0)	8.8	12.6
Other Comprehensive Income (Loss), Net of Tax	18.5	(3.4)	28.6	43.1
Comprehensive (Loss) Income	$ 17.1	$ 1.9	$ 256.5	$ 324.7