Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Operating activities
Net income	$ 484.0	$ 522.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	98.2	107.9
Amortization of premiums and discounts on AFS securities, net	18.5	20.4
Amortization of deferred contract costs	95.1	92.4
Stock-based compensation costs	25.5	23.8
Benefit from deferred income taxes	(6.7)	(2.7)
Provision for allowance for doubtful accounts	4.7	3.4
Net realized gains on sales of AFS securities	(0.7)	(1.8)
Changes in operating assets and liabilities:
Interest receivable	1.4	(1.6)
Accounts receivable and PEO unbilled receivables, net	(207.6)	(53.2)
Prepaid expenses and other current assets	(18.8)	(44.5)
Accounts payable and other current liabilities	(14.8)	(14.5)
Deferred costs	(89.7)	(85.3)
Net change in other long-term assets and liabilities	35.9	(2.7)
Net change in operating lease right-of-use assets and liabilities	5.7	0.1
Net cash provided by operating activities	430.7	564.6
Investing activities
Purchases of AFS securities	(4,215.4)	(13,537.8)
Proceeds from sales and maturities of AFS securities	3,777.2	14,167.1
Purchases of property and equipment	(54.6)	(59.9)
Proceeds from sales of property and equipment	3.8
Purchases of other assets	(1.4)	(4.2)
Net cash (used in)/provided by investing activities	(490.4)	565.2
Financing activities
Net change in client fund obligations	(46.4)	(88.0)
Net proceeds from short-term borrowings	1.8	51.3
Dividends paid	(446.7)	(444.3)
Repurchases of common shares	(28.8)	(171.9)
Activity related to equity-based plans	57.7	7.9
Net cash used in financing activities	(462.4)	(645.0)
Net change in cash, restricted cash, and equivalents	(522.1)	484.8
Cash, restricted cash, and equivalents, beginning of period	1,659.8	935.2
Cash, restricted cash, and equivalents, end of period	1,137.7	1,420.0
Reconciliation of cash, restricted cash, and equivalents
Cash and cash equivalents	693.5	600.6
Restricted cash	84.9	62.7
Restricted cash and restricted cash equivalents included in funds held for clients	$ 359.3	$ 756.7