Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Operating activities:
Net income	$ 1,278.0	$ 919.1	$ 1,344.3
Adjustments to arrive at cash provided by operating activities
Depreciation	133.8	126.6	123.9
Amortization of intangible assets	116.6	112.3	65.9
Change in fair value of investments	(279.3)	136.9	(397.4)
Share-based compensation expense	88.3	68.1	51.7
Retirement benefit expense	125.3	76.4	155.1
Pension contributions	(25.9)	(53.6)	(35.8)
Deferred income taxes	(100.1)	(33.6)	(184.1)
Net loss on disposition of property	0.5	0.6	0.5
Settlement of interest rate derivatives	0.0	0.0	(28.0)
Goodwill impairment	157.5	0.0	0.0
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency adjustments
Receivables	(368.7)	(415.6)	(138.1)
Inventories	(295.9)	(292.8)	(202.8)
Accounts payable	70.2	172.0	184.8
Contract liabilities	106.8	102.0	104.4
Compensation and benefits	209.1	(78.2)	174.6
Income taxes	104.1	(129.3)	57.2
Other assets and liabilities	54.3	112.2	(15.2)
Cash provided by operating activities	1,374.6	823.1	1,261.0
Investing activities:
Capital expenditures	(160.5)	(141.1)	(120.3)
Acquisition of businesses, net of cash acquired	(168.4)	(16.6)	(2,488.5)
Purchases of investments	(27.1)	(59.8)	(13.6)
Proceeds from sale of investments	1,210.4	210.2	0.0
Other investing activities	(0.1)	(0.5)	(4.2)
Cash provided by (used for) investing activities	854.3	(7.8)	(2,626.6)
Financing activities:
Net (repayment) issuance of short-term debt	(256.9)	40.8	275.9
Issuance of short-term debt, net of issuance costs	0.0	18.8	211.4
Issuance of long-term debt, net of discount and issuance costs	0.0	0.0	1,485.6
Repayment of short-term debt	(18.8)	(210.0)	(2.5)
Repayment of long-term debt	(599.8)	0.0	0.0
Cash dividends	(542.4)	(519.4)	(497.1)
Purchases of treasury stock	(311.5)	(301.3)	(299.7)
Proceeds from the exercise of stock options	88.5	57.9	154.6
Other financing activities	(34.7)	(21.0)	(30.4)
Cash (used for) provided by financing activities	(1,675.6)	(934.2)	1,297.8
Effect of exchange rate changes on cash	19.2	(52.6)	16.8
Increase (decrease) in cash, cash equivalents, and restricted cash	572.5	(171.5)	(51.0)
Cash, cash equivalents, and restricted cash at beginning of year	507.9	679.4	730.4
Cash, cash equivalents, and restricted cash at end of year	1,080.4	507.9	679.4
Components of cash, cash equivalents, and restricted cash
Cash and cash equivalents	1,071.8	490.7	662.2
Restricted cash, current (Other current assets)	8.6	8.6	0.0
Restricted cash, noncurrent (Other assets)	0.0	8.6	17.2
Total cash, cash equivalents, and restricted cash	$ 1,080.4	$ 507.9	$ 679.4