Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 445.3	$ 426.3
Adjustments to arrive at cash provided by operating activities:
Depreciation	60.2	62.1
Amortization of intangible assets	24.0	13.2
Change in fair value of investments	73.8	114.5
Share-based compensation expense	22.4	21.8
Retirement benefit expense	63.4	34.4
Pension contributions	(17.3)	(15.1)
Net (gain) loss on disposition of property	(1.2)	1.7
Settlement of treasury locks	0.0	(35.7)
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency adjustments:
Receivables	(134.2)	(41.5)
Inventories	(12.1)	(86.0)
Accounts payable	50.9	(12.1)
Contract liabilities	52.4	41.2
Compensation and benefits	(99.1)	(90.5)
Income taxes	(79.2)	(66.7)
Other assets and liabilities	(0.8)	(11.8)
Cash provided by operating activities	448.5	355.8
Investing activities:
Capital expenditures	(56.6)	(80.9)
Acquisition of businesses, net of cash acquired	(259.3)	(20.7)
Purchases of investments	(2.6)	(2.8)
Proceeds from maturities of investments	5.4	219.2
Proceeds from sale of investments	37.9	0.0
Proceeds from sale of property	1.6	3.3
Cash (used for) provided by investing activities	(273.6)	118.1
Financing activities:
Net issuance (repayment) of short-term debt	81.5	(549.7)
Issuance of long-term debt, net of discount and issuance costs	0.0	987.6
Repayment of long-term debt	(300.0)	0.0
Cash dividends	(236.3)	(232.5)
Purchases of treasury stock	(213.7)	(535.2)
Proceeds from the exercise of stock options	133.7	23.8
Other financing activities	0.8	0.0
Cash used for financing activities	(534.0)	(306.0)
Effect of exchange rate changes on cash	(17.5)	(6.7)
(Decrease) increase in cash and cash equivalents	(376.6)	161.2
Cash and cash equivalents at beginning of period	1,018.4	618.8
Cash and cash equivalents at end of period	$ 641.8	$ 780.0