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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2017 | May 31, 2016 | May 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income (loss) | $ 52.3 | $ 40.5 | $ 294.6
Other comprehensive income (loss), net: |  |  |
Foreign currency translation adjustments | (5.3) | (8.1) | (15.3)
Pension and post-retirement adjustments: |  |  |
Amortization of prior service credit | 0.0 | 0.0 | (0.2)
Net actuarial gain (loss) associated with benefit plans | (2.2) | (1.6) | (6.3)
Total other comprehensive income (loss) | (7.5) | (9.7) | (21.8)
Comprehensive income (loss) | $ 44.8 | $ 30.8 | $ 272.8

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