Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 34.0	$ 22.1	$ 57.5	$ 26.4
Other Comprehensive (Loss) Income, net of tax (Note 7):
Available-for-sale securities and hedges	(0.2)	(1.8)	10.0	(1.7)
Foreign currency translation adjustment	14.0	12.6	(25.5)	2.4
Change in pension and postretirement defined benefit plans	0.8	0.6	2.1	1.3
Total Other Comprehensive Income (Loss), net of tax	14.6	11.4	(13.4)	2.0
Total Comprehensive Income	48.6	33.5	44.1	28.4
Less: Comprehensive loss attributable to noncontrolling interests	(0.4)	(0.2)	(0.7)	(0.7)
Total Comprehensive Income Attributable to Common Shareholders	$ 49.0	$ 33.7	$ 44.8	$ 29.1