Consolidated Comprehensive Income Statements (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Consolidated Comprehensive Income Statements [Abstract]
Tax effect on translation adjustments	$ (19.1)	$ 61.4	$ (25.8)	$ 77.5
Tax effect on net gain (loss) on derivatives	10.2	(1.4)	15.0	(12.8)
Tax effect on pension and postretirement benefits	0.0	(2.7)	0.0	(2.7)
Tax effect on derivatives reclassification adjustments	(0.5)	6.2	(8.5)	11.6
Tax effect on pension and post retirement benefits reclassification adjustments	$ 11.3	$ 14.7	$ 21.4	$ 24.8