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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Less: Tax effect | $ 22.1 | $ 37.9
Net income (loss) | (61.3) | (63.7)
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) | 0.2 | 0.6
Less: Tax effect | 0.0 | (0.1)
Net income (loss) | $ 0.2 | $ 0.5

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