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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2017 | Aug. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Less: Tax effect | $ 37.9 | $ 23.9
Net income (loss) | (63.7) | (39.6)
Amount reclassified from Accumulated other comprehensive income (loss) | Retirement benefit plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of unrecognized gain (loss) included in net periodic benefit (cost) | 0.6 | 1.0
Less: Tax effect | (0.1) | (0.3)
Net income (loss) | $ 0.5 | $ 0.7

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