Consolidated Statements of Total Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income	Non-controlling Interests
Beginning Balances at Sep. 30, 2009
Increase (Decrease) in Stockholders' Equity
Treasury stock purchases (3,544,838 shares)					$ 38.6
Ending Balances at Sep. 30, 2010	2,622.9	3.2	1,894.8	810.6	(95.7)	0.3	9.7
Increase (Decrease) in Stockholders' Equity
Net income	71.8			71.8
Issuances under employee benefit plans (107,952 shares in 2010, 91,350 shares in 2011 and 79,455 shares in 2012)	0.9		0.9
Exercise of stock options (1,234,396 shares in 2010, 303,535 shares in 2011 and 4,493,797 shares in 2012)	2.5		2.5
Stock issued under Performance Unit Plan (369,818 shares in 2011 and 275,625 shares in 2012)	4.6		4.6
Stock based compensation expense	14.2		14.2
Cash dividends declared	(47.8)			(47.8)
Treasury stock purchases (3,544,838 shares)	(38.6)	0	0	0		0	0
Other comprehensive income (loss)	(0.2)					(0.2)
Noncontrolling interests	(6.8)						(6.8)
Ending Balances at Sep. 30, 2011	2,623.5	3.2	1,917.0	834.6	(134.3)	0.1	2.9
Increase (Decrease) in Stockholders' Equity
Net income	956.3			956.3
Issuances under employee benefit plans (107,952 shares in 2010, 91,350 shares in 2011 and 79,455 shares in 2012)	0.9		0.9
Exercise of stock options (1,234,396 shares in 2010, 303,535 shares in 2011 and 4,493,797 shares in 2012)	40.8	0.1	40.7
Stock issued under Performance Unit Plan (369,818 shares in 2011 and 275,625 shares in 2012)	3.1		3.1
Stock based compensation expense	18.1		18.1
Cash dividends declared	(47.8)			(47.8)
Other comprehensive income (loss)	0.1					0.1
Noncontrolling interests	(0.3)						(0.3)
Ending Balances at Sep. 30, 2012	3,594.7	3.3	1,979.8	1,743.1	(134.3)	0.2	2.6
Increase (Decrease) in Stockholders' Equity
Net income	462.7			462.7
Issuances under employee benefit plans (107,952 shares in 2010, 91,350 shares in 2011 and 79,455 shares in 2012)	1.1		1.1
Exercise of stock options (1,234,396 shares in 2010, 303,535 shares in 2011 and 4,493,797 shares in 2012)	37.8	0	37.8
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	6.7	0	6.7
Stock issued under Performance Unit Plan (369,818 shares in 2011 and 275,625 shares in 2012)	(2.4)		(2.4)
Stock based compensation expense	19.0		19.0
Cash dividends declared	(60.2)			(60.2)
Other comprehensive income (loss)	1.7					1.7
Noncontrolling interests	0.3						0.3
Ending Balances at Sep. 30, 2013	$ 4,061.4	$ 3.3	$ 2,042.0	$ 2,145.6	$ (134.3)	$ 1.9	$ 2.9