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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, 2017 | Feb. 29, 2016 | Feb. 28, 2017 | Feb. 29, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Less: Tax effect | $ 8.4 | $ 9.4 | $ (10.8) | $ (1.5)
Net income (loss) | (15.4) | (9.0) | 12.9 | 6.5
Amount reclassified from Accumulated other comprehensive income (loss) | Retirement benefit plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of prior service cost (credit) | 0.0 | 0.0 | 0.0 | 0.0
Amortization of unrecognized gain (loss) included in net periodic cost (credit) | 1.0 | 1.1 | 3.1 | 3.3
Less: Tax effect | (0.3) | (0.3) | (1.0) | (1.0)
Net income (loss) | $ 0.7 | $ 0.8 | $ 2.1 | $ 2.3

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