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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Aug. 31, 2014 | Aug. 31, 2013
OPERATING ACTIVITIES |  |
Net income | $ 171.3 | $ 162.8
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization on property and equipment and intangible assets | 26.5 | 24.4
Amortization of premiums and discounts on available-for-sale securities, net | 18.4 | 16.7
Stock-based compensation costs | 7.5 | 7.5
Provision for deferred income taxes | 10.4 | 10.3
Provision for allowance for doubtful accounts | 0.3 | 0.8
Net realized gains on sales of available-for-sale securities | (0.1) | (0.2)
Changes in operating assets and liabilities: |  |
Interest receivable | 6.7 | 3.7
Accounts receivable | (19.1) | (22.1)
Prepaid expenses and other current assets | 7.8 | 44.5
Accounts payable and other current liabilities | 40.4 | 15.4
Net change in other assets and liabilities | (7.0) | 2.9
Net cash provided by operating activities | 263.1 | 266.7
INVESTING ACTIVITIES |  |
Purchases of available-for-sale securities | (9,461.0) | (6,372.8)
Proceeds from sales and maturities of available-for-sale securities | 10,073.7 | 6,696.4
Net change in funds held for clients' money market securities and other cash equivalents | (199.9) | (267.0)
Purchases of property and equipment | (24.9) | (25.1)
Acquisition of business, net of cash acquired | (27.5) | 0
Purchases of other assets | (1.5) | (0.7)
Net cash provided by investing activities | 358.9 | 30.8
FINANCING ACTIVITIES |  |
Net change in client fund obligations | (137.1) | (126.6)
Dividends paid | (138.3) | (127.9)
Repurchases of common shares | (37.5) | (83.9)
Equity activity related to stock-based awards | 1.0 | 45.2
Net cash used in financing activities | (311.9) | (293.2)
Increase in cash and cash equivalents | 310.1 | 4.3
Cash and cash equivalents, beginning of period | 152.5 | 107.3
Cash and cash equivalents, end of period | $ 462.6 | $ 111.6

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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