Consolidated Statements of Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning balance at Sep. 30, 2011			$ 1,542.5	$ (855.2)	$ 763.8	$ (8.8)	$ 2.4
Beginning shares (in shares) at Sep. 30, 2011		341.9
Shares issued:
Employee stock plans (in shares)		1.6
Treasury stock retired (in shares)		0
Additional paid-in capital
Employee stock plan shares issued			9.4
Share-based compensation			33.2
Treasury shares acquired	(475.2)			(475.2)
RSA forfeitures				(2.5)
Treasury stock retirement			0	0	0
Dividends declared					(68.7)
Other comprehensive income (loss)						13.3
Change in ownership							(2.4)
Net income (loss)					245.9
Total comprehensive income	4.5
Ending balance at Sep. 30, 2012			1,585.1	(1,332.9)	941.0	4.5	0
Ending balance at Sep. 30, 2012		0.1
Ending shares (in shares) at Sep. 30, 2012		343.5
Shares issued:
Employee stock plans (in shares)		2.9
Treasury stock retired (in shares)		(75.0)
Additional paid-in capital
Employee stock plan shares issued			23.7
Share-based compensation			39.4
Treasury shares acquired	(190.5)			(190.5)
RSA forfeitures				(3.7)
Treasury stock retirement			(215.1)	1,252.2	(1,037.1)
Dividends declared					(88.9)
Other comprehensive income (loss)	3.7					3.7
Change in ownership							0
Net income (loss)					272.7
Total comprehensive income	8.2
Ending balance at Sep. 30, 2013	1,254.1		1,433.1	(274.9)	87.7	8.2	0
Ending balance at Sep. 30, 2013	0	0
Ending shares (in shares) at Sep. 30, 2013	271.4	271.4
Shares issued:
Employee stock plans (in shares)		3.3
Treasury stock retired (in shares)		0
Additional paid-in capital
Employee stock plan shares issued			7.5
Share-based compensation			32.1
Treasury shares acquired	(211.6)			(211.6)
RSA forfeitures				0
Treasury stock retirement			0	0	0
Dividends declared					(109.0)
Other comprehensive income (loss)	(23.4)					(23.4)
Change in ownership							0
Net income (loss)					247.9
Total comprehensive income	(15.2)
Ending balance at Sep. 30, 2014	1,197.6		1,472.7	(486.5)	226.6	(15.2)	0
Ending balance at Sep. 30, 2014	$ 0	$ 0
Ending shares (in shares) at Sep. 30, 2014	274.7	274.7