Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net income	$ 315.4	$ 80.3
Adjustments to arrive at cash provided by operating activities:
Depreciation	30.2	29.3
Amortization of intangible assets	11.7	6.6
Change in fair value of investments	(71.0)	212.7
Share-based compensation expense	11.5	11.0
Retirement benefit expense	31.8	17.2
Pension contributions	(7.1)	(6.1)
Net loss on disposition of property	0.0	1.3
Changes in assets and liabilities, excluding effects of acquisitions and foreign currency adjustments:
Receivables	(85.0)	(6.1)
Inventories	1.7	(52.4)
Accounts payable	(0.4)	(31.2)
Contract liabilities	37.3	26.9
Compensation and benefits	(38.6)	(85.4)
Income taxes	(17.3)	12.2
Other assets and liabilities	10.9	(4.3)
Cash provided by operating activities	231.1	212.0
Investing activities:
Capital expenditures	(37.0)	(42.0)
Acquisition of businesses, net of cash acquired	(238.5)	0.0
Purchases of investments	(1.0)	(2.8)
Proceeds from maturities of investments	5.4	185.6
Proceeds from sale of investments	37.9	0.0
Proceeds from sale of property	0.2	0.1
Cash (used for) provided by investing activities	(233.0)	140.9
Financing activities:
Net issuance of short-term debt	23.5	80.3
Cash dividends	(117.9)	(116.9)
Purchases of treasury stock	(106.0)	(295.1)
Proceeds from the exercise of stock options	104.8	4.0
Cash used for financing activities	(95.6)	(327.7)
Effect of exchange rate changes on cash	5.3	(11.7)
(Decrease) increase in cash and cash equivalents	(92.2)	13.5
Cash and cash equivalents at beginning of period	1,018.4	618.8
Cash and cash equivalents at end of period	$ 926.2	$ 632.3