Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net income	$ 1,023.2	$ 695.8	$ 535.5
Adjustments to arrive at cash provided by operating activities:
Depreciation	122.5	126.2	136.4
Amortization of intangible assets	50.2	26.0	28.2
Change in fair value of investments	(153.9)	368.5	(90.0)
Share-based compensation expense	46.1	43.1	38.5
Retirement benefit expense	129.5	70.7	114.0
Pension contributions	(84.1)	(30.9)	(50.3)
Deferred income taxes	(65.7)	(29.0)	170.5
Net (gain) loss on disposition of property	(12.4)	1.8	2.5
Settlement of interest rate derivatives	22.0	(35.7)	0.0
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency adjustments:
Receivables	(9.0)	(10.4)	(91.7)
Inventories	30.4	(4.9)	(37.4)
Accounts payable	(5.0)	14.5	67.2
Contract liabilities	43.3	12.1	12.9
Compensation and benefits	(44.6)	(45.2)	22.4
Income taxes	(11.8)	(18.8)	426.7
Other assets and liabilities	39.8	(1.8)	14.6
Cash provided by operating activities	1,120.5	1,182.0	1,300.0
Investing activities:
Capital expenditures	(113.9)	(132.8)	(125.5)
Acquisition of businesses, net of cash acquired	(550.9)	(20.7)	(9.9)
Purchases of investments	(10.7)	(5.1)	(1,296.9)
Proceeds from maturities of investments	6.0	312.8	1,106.1
Proceeds from sale of investments	37.9	66.3	155.3
Proceeds from sale of property	14.9	4.5	0.5
Other investing activities	(1.3)	0.0	0.0
Cash (used for) provided by investing activities	(618.0)	225.0	(170.4)
Financing activities:
Net (repayment) issuance of short-term debt		(551.0)	200.6
Issuance of short-term debt, net of issuance costs	423.6	0.0	0.0
Issuance of long-term debt, net of discount and issuance costs	0.0	987.6	0.0
Repayment of short-term debt	(400.0)	0.0	0.0
Repayment of long-term debt	(300.7)	0.0	(250.0)
Cash dividends	(472.8)	(459.8)	(440.8)
Purchases of treasury stock	(264.2)	(1,009.0)	(1,482.3)
Proceeds from the exercise of stock options	214.4	47.4	81.8
Other financing activities	0.8	(1.1)	1.8
Cash used for financing activities	(798.9)	(985.9)	(1,888.9)
Effect of exchange rate changes on cash	8.4	(21.5)	(32.8)
(Decrease) increase in cash, cash equivalents, and restricted cash	(288.0)	399.6	(792.1)
Cash, cash equivalents, and restricted cash at beginning of year	1,018.4	618.8	1,410.9
Cash, cash equivalents, and restricted cash at end of year	730.4	1,018.4	618.8
Components of cash, cash equivalents, and restricted cash
Total cash, cash equivalents, and restricted cash	$ 1,018.4	$ 618.8	$ 618.8