Condensed Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 337.3	$ 351.1
Adjustments to arrive at cash provided by operating activities:
Depreciation	55.1	50.3
Amortization of intangible assets	16.3	17.5
Share-based compensation expense	21.2	22.3
Retirement benefit expense	85.3	52.5
Pension trust contributions	(20.1)	(318.4)
Net loss on disposition of property and investments	0.1	0.1
Income tax benefit from the exercise of stock options	1.9	0.5
Excess income tax benefit from share-based compensation	(21.0)	(16.8)
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency adjustments:
Receivables	39.7	(86.0)
Inventories	(19.8)	(15.1)
Accounts payable	(73.7)	(4.0)
Advance payments from customers and deferred revenue	40.1	54.5
Compensation and benefits	(66.8)	(128.3)
Income taxes	17.4	81.2
Other assets and liabilities	(43.1)	3.1
Cash provided by operating activities	369.9	64.5
Investing activities:
Capital expenditures	(55.0)	(62.5)
Acquisition of businesses, net of cash acquired	(84.8)	(15.9)
Purchases of short-term investments	(188.6)	(312.5)
Proceeds from maturities of short-term investments	175.0	0
Proceeds from sale of property and investments	0.2	2.3
Other investing activities	(1.9)	0
Cash used for investing activities	(155.1)	(388.6)
Financing activities:
Net issuance of short-term debt	79.0	259.0
Cash dividends	(131.6)	(121.0)
Purchases of treasury stock	(211.1)	(45.5)
Proceeds from the exercise of stock options	104.4	42.0
Excess income tax benefit from share-based compensation	21.0	16.8
Other financing activities	0	(0.2)
Cash (used for) provided by financing activities	(138.3)	151.1
Effect of exchange rate changes on cash	(6.3)	(3.6)
Cash provided by (used for) continuing operations	70.2	(176.6)
Discontinued operations:
Cash used for discontinued operating activities	(7.0)	(0.5)
Cash used for discontinued operations	(7.0)	(0.5)
Increase (decrease) in cash and cash equivalents	63.2	(177.1)
Cash and cash equivalents at beginning of period	903.9	988.9
Cash and cash equivalents at end of period	$ 967.1	$ 811.8