Fair Value Measurements (Tables)

9 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair Value On A Recurring Basis

Assets and Liabilities Measured at Fair Value on a Recurring Basis (in millions):

			Fair Value Measurements at Reporting Date Using
	Balance at June 30, 2013		Quoted Prices in Active Markets for  Identical Assets (Level 1)		Significant  Other Observable  Inputs (Level 2)		Significant Unobservable  Inputs (Level 3)
Assets:
Cash and cash equivalents	$	1,430.8	$	1,430.8	$	—	$	—
Short-term investments:
Available-for-sale securities
Agency obligations	10.0		—		10.0		—
Commercial paper	123.9		—		123.9		—
Corporate debt securities	71.9		—		71.9		—
Government treasury securities	311.9		311.9		—		—
Certificates of deposit	34.1		—		34.1		—
Total available-for-sale securities	551.8		311.9		239.9		—
Trading securities	61.7		61.7		—		—
Total short-term investments	613.5		373.6		239.9		—
Short-term derivatives	68.6		—		68.6		—
Long-term investments:
Available-for-sale securities
Agency obligations	4.0		—		4.0		—
Corporate debt securities	27.7		—		27.7		—
Auction rate securities	13.8		—		—		13.8
Total long-term investments	45.5		—		31.7		13.8
Long-term derivatives	12.9		—		12.9		—
Total	$	2,171.3	$	1,804.4	$	353.1	$	13.8
Liabilities:
Short-term derivatives	$	3.0	$	—	$	3.0	$	—

			Fair Value Measurements at Reporting Date Using
	Balance at September 30, 2012		Quoted Prices in Active Markets for  Identical Assets (Level 1)		Significant  Other Observable  Inputs (Level 2)		Significant Unobservable  Inputs (Level 3)
Assets:
Cash and cash equivalents	$	1,188.6	$	1,188.6	$	—	$	—
Short-term investments:
Available-for-sale securities
Agency obligations	80.0		—		80.0		—
Commercial paper	103.9		—		103.9		—
Corporate debt securities	84.3		—		84.3		—
Government treasury securities	459.7		459.7		—		—
Certificates of deposit	62.9		—		62.9		—
Total available-for-sale securities	790.8		459.7		331.1		—
Trading securities	57.6		57.6		—		—
Total short-term investments	848.4		517.3		331.1		—
Short-term derivatives	9.5		—		9.5		—
Long-term investments:
Available-for-sale securities
Agency obligations	14.0		—		14.0		—
Corporate debt securities	61.3		—		61.3		—
Auction rate securities	18.6		—		—		18.6
Certificates of deposit	22.1		—		22.1		—
Total long-term investments	116.0		—		97.4		18.6
Total	$	2,162.5	$	1,705.9	$	438.0	$	18.6
Liabilities:
Short-term derivatives	$	18.9	$	—	$	18.9	$	—
Long-term derivatives	3.0		—		3.0		—
Total	$	21.9	$	—	$	21.9	$	—