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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Total
--- | --- | --- | --- | --- | ---
Beginning balance, Shares at May. 31, 2014 | 363.0 |  |  |  |
Beginning balance at May. 31, 2014 | $ 3.6 | $ 794.4 | $ 957.5 | $ 21.5 | $ 1,777.0
Net income |  |  | 674.9 |  | 674.9
Unrealized gains/(losses) on securities, net of tax |  |  |  | (14.0) | (14.0)
Cash dividends declared |  |  | (551.8) |  | (551.8)
Repurchases of common shares, Shares | (3.9) |  |  |  |
Repurchases of common shares |  | (7.2) | (175.2) |  | (182.4)
Stock-based compensation |  | 31.5 |  |  | 31.5
Activity related to equity-based plans, Shares | 2.1 |  |  |  |
Activity related to equity-based plans |  | 61.4 | (11.1) |  | 50.3
Ending balance, Shares at May. 31, 2015 | 361.2 |  |  |  |
Ending balance at May. 31, 2015 | $ 3.6 | 880.1 | 894.3 | 7.5 | 1,785.5
Net income |  |  | 756.8 |  | 756.8
Unrealized gains/(losses) on securities, net of tax |  |  |  | 21.7 | 21.7
Cash dividends declared |  |  | (606.5) |  | (606.5)
Repurchases of common shares, Shares | (2.2) |  |  |  |
Repurchases of common shares |  | (4.1) | (103.8) |  | (107.9)
Stock-based compensation |  | 34.6 |  |  | 34.6
Activity related to equity-based plans, Shares | 1.4 |  |  |  |
Activity related to equity-based plans |  | 42.1 | (14.6) |  | $ 27.5
Ending balance, Shares at May. 31, 2016 | 360.4 |  |  |  | 360.4
Ending balance at May. 31, 2016 | $ 3.6 | 952.7 | 926.2 | 29.2 | $ 1,911.7
Net income |  |  | 817.3 |  | 817.3
Unrealized gains/(losses) on securities, net of tax |  |  |  | (9.2) | (9.2)
Cash dividends declared |  |  | (662.3) |  | $ (662.3)
Repurchases of common shares, Shares | (2.9) |  |  |  | (2.9)
Repurchases of common shares |  | (5.4) | (160.8) |  | $ (166.2)
Stock-based compensation |  | 35.4 |  |  | 35.4
Activity related to equity-based plans, Shares | 1.9 |  |  |  |
Activity related to equity-based plans |  | 47.3 | (18.7) |  | $ 28.6
Ending balance, Shares at May. 31, 2017 | 359.4 |  |  |  | 359.4
Ending balance at May. 31, 2017 | $ 3.6 | $ 1,030.0 | $ 901.7 | $ 20.0 | $ 1,955.3

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256 + Details
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- Definition Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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