CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Stock in Treasury, at Cost
Balance at Sep. 30, 2015	$ 1,911.1	$ 0.9	$ 771.5	$ 2,016.5	$ (144.4)	$ (733.4)
Changes in Equity
Net income	14.6			14.6
Employee pension and postretirement benefits	0.5				0.5
Currency translation adjustments	(11.2)				(11.2)
Cash dividends	(14.1)			(14.1)
Repurchases of Common Stock	(100.1)					(100.1)
Exercise of stock options	1.4					1.4
Stock-based compensation expense	5.3		5.3
Excess tax benefit from stock-based compensation	0.1		0.1
Payment of earned performance shares	0.0		(2.6)			2.6
Shares tendered for taxes on stock-based compensation	(1.4)					(1.4)
Derivative instruments	0.2				0.2
Balance at Dec. 31, 2015	1,806.4	0.9	774.3	2,017.0	(154.9)	(830.9)
Balance at Sep. 30, 2016	1,976.5	0.9	782.3	2,177.0	(175.0)	(808.7)
Changes in Equity
Net income	19.2			19.2
Employee pension and postretirement benefits	0.8				0.8
Currency translation adjustments	(30.4)				(30.4)
Cash dividends	(15.6)			(15.6)
Exercise of stock options	26.2		5.7			20.5
Stock-based compensation expense	6.5		6.5
Payment of earned performance shares	0.0		(1.3)			1.3
Shares tendered for taxes on stock-based compensation	(3.0)					(3.0)
Derivative instruments	0.0
Other	0.1		(3.1)			3.2
Balance at Dec. 31, 2016	$ 1,980.3	$ 0.9	$ 790.1	$ 2,180.6	$ (204.6)	$ (786.7)