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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 31 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2018 | Feb. 28, 2018 | Jul. 22, 2015
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |
Additional authorization July 2015 |  |  |  | $ 50.0
Less repurchases made under the authorization as of February 28, 2018 | $ (11.8) | $ (25.1) | $ (36.6) |
Remaining Board authorization at February 28, 2018 | $ 13.4 | $ 13.4 | $ 13.4 |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: 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=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: 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 + Details
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