STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 132.3	$ 122.8	$ 46.8
Other Comprehensive Income (Loss), Net of Tax:
Available-for-sale securities and hedges	7.4	(3.1)	0.0
Foreign currency translation adjustment	33.9	(22.4)	(58.6)
Change in pension and postretirement defined benefit plans	17.8	(2.8)	(8.1)
Total Other Comprehensive Income (Loss), Net of Tax	59.1	(28.3)	(66.7)
Total Comprehensive Income (Loss)	191.4	94.5	(19.9)
Less: Comprehensive loss attributable to noncontrolling interests	(1.3)	(1.3)	(0.9)
Total Comprehensive Income (Loss) Attributable to Common Shareholders	$ 192.7	$ 95.8	$ (19.0)