Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 42.2	$ 88.3
Other Comprehensive (Loss) Income, net of tax (Note 7):
Derivative instruments and hedges	(3.7)	3.4
Foreign currency translation adjustment	(13.6)	6.1
Change in pension and postretirement defined benefit plans	0.4	0.8
Total Other Comprehensive Income (Loss), net of tax	(16.9)	10.3
Total Comprehensive Income	$ 25.3	$ 98.6