CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at Sep. 30, 2015	$ 605.8		$ 350.9	$ 372.1	$ (21.0)	$ (107.9)	$ 11.7
Balance (in shares) at Sep. 30, 2015		63,600,000			700,000
Increase (Decrease) in Stockholders' Equity
Total other comprehensive income, net of tax	(22.2)					(21.9)	(0.3)
Net income	116.8			112.8			4.0
Issuance/retirement of stock for stock awards/options	11.1		(11.2)		$ 22.3
Issuance/retirement of stock for stock awards/options (in shares)		(100,000)			(700,000)
Share-based compensation	8.5		8.5
Treasury Stock, Shares, Acquired					700,000
Purchases of common stock	21.2				$ 21.2
Dividends	(52.6)		(0.5)	(51.6)			(1.5)
Balance at Sep. 30, 2016	646.2		348.7	433.3	$ (19.9)	(129.8)	13.9
Balance (in shares) at Sep. 30, 2016		63,700,000			700,000
Increase (Decrease) in Stockholders' Equity
Total other comprehensive income, net of tax	48.8					48.6	0.2
Net income	128.4			126.2			2.2
Issuance/retirement of stock for stock awards/options	$ 13.7		(9.8)		$ 23.5
Issuance/retirement of stock for stock awards/options (in shares)	(700,000)	(100,000)			(700,000)
Share-based compensation	$ 10.5		10.5
Treasury Stock, Shares, Acquired					700,000
Purchases of common stock	28.0				$ 28.0
Dividends	(53.7)		(0.5)	(52.4)			(1.8)
Balance at Sep. 30, 2017	765.9		349.9	507.1	$ (24.4)	(81.2)	14.5
Balance (in shares) at Sep. 30, 2017		63,800,000			700,000
Increase (Decrease) in Stockholders' Equity
Total other comprehensive income, net of tax	(3.7)					(3.0)	(0.7)
Net income	81.2			76.6			4.6
Issuance/retirement of stock for stock awards/options	$ 7.1		(11.2)		$ 18.3
Issuance/retirement of stock for stock awards/options (in shares)	(500,000)	(100,000)			(500,000)
Share-based compensation	$ 12.1		12.1
Treasury Stock, Shares, Acquired					1,400,000
Purchases of common stock	61.0				$ 61.0
Dividends	(57.5)		(0.6)	(52.7)			(5.4)
Balance at Sep. 30, 2018	$ 744.1		$ 351.4	$ 531.0	$ (67.1)	$ (84.2)	$ 13.0
Balance (in shares) at Sep. 30, 2018		63,900,000			1,600,000