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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Less: Tax effect | $ 14.1 | $ 8.4 | $ 17.4 | $ (10.8)
Net income (loss) | (49.2) | (15.4) | (55.8) | 12.9
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) | 0.6 | 1.0 | 1.8 | 3.1
Settlement charge | 39.6 | 0.0 | 55.0 | 0.0
Other reclassifications, net | (3.4) | 0.0 | (4.6) | 0.0
Less: Tax effect | (14.6) | (0.3) | (20.6) | (1.0)
Net income (loss) | $ 22.2 | $ 0.7 | $ 31.6 | $ 2.1

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