Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 44.5	$ 53.7	$ 69.8	$ 152.3
Net Income	49.5	28.5	91.7	116.8
Other Comprehensive (Loss) Income, net of tax (Note 7):
Derivative instruments designated as hedges	(1.9)	7.9	(5.6)	11.3
Foreign currency translation adjustment	(3.6)	16.5	(17.2)	22.6
Change in pension and postretirement defined benefit plans	0.5	0.8	0.9	1.6
Total Other Comprehensive Income (Loss), net of tax	$ (5.0)	$ 25.2	$ (21.9)	$ 35.5