Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 58.8	$ 39.8
Other Comprehensive (Loss) Income, net of tax (Note 7):
Derivative instruments designated as hedges	(4.9)	(2.6)
Foreign currency translation adjustment	41.3	23.1
Change in pension and postretirement defined benefit plans	0.5	0.7
Other Comprehensive Income (Loss), Net of Tax, Total	36.9	21.2
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 95.7	$ 61.0