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Goodwill and Other Intangibles (Tables) | 6 Months Ended
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Nov. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Activity in Goodwill for the Periods Indicated | The following table summarizes the activity in Goodwill for the periods indicated:
| Six months ended November 30, 2015 |  | Twelve months ended May 31, 2015 |  | Six months ended November 30, 2014
Gross beginning balance | $ | 155.9 |  |  | $ | 156.0 |  |  | $ | 156.0 |
Accumulated impairment | (39.6 | ) |  | (34.2 | ) |  | (34.2 | )
Beginning balance | $ | 116.3 |  |  | $ | 121.8 |  |  | $ | 121.8 |
Impairment charge | — |  |  | (5.4 | ) |  | — |
Foreign currency translation | (0.1 | ) |  | (0.1 | ) |  | 0.0 |
Gross ending balance | $ | 155.8 |  |  | $ | 155.9 |  |  | $ | 156.0 |
Accumulated impairment | (39.6 | ) |  | (39.6 | ) |  | (34.2 | )
Ending balance | $ | 116.2 |  |  | $ | 116.3 |  |  | $ | 121.8 |
Summary of Activity in Total Other Intangibles for the Periods Indicated | The following table summarizes the activity in Total other intangibles for the periods indicated:
| Six months ended November 30, 2015 |  | Twelve months ended May 31, 2015 |  | Six months ended November 30, 2014
Beginning balance - Other intangibles subject to amortization | $ | 4.7 |  |  | $ | 5.8 |  |  | $ | 5.8 |
Additions | 2.4 |  |  | 0.8 |  |  | 0.8 |
Amortization expense | (1.1 | ) |  | (1.9 | ) |  | (1.0 | )
Total other intangibles subject to amortization, net of accumulated amortization of $18.4, $17.3 and $16.3, respectively | $ | 6.0 |  |  | $ | 4.7 |  |  | $ | 5.6 |
Total other intangibles not subject to amortization | $ | 2.1 |  |  | $ | 2.1 |  |  | $ | 2.1 |
Total other intangibles | $ | 8.1 |  |  | $ | 6.8 |  |  | $ | 7.7 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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