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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2015 | Nov. 30, 2014 | Nov. 30, 2015 | Nov. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Less: Tax effect | $ (41.6) | $ (42.9) | $ (10.9) | $ (9.1)
Net income (loss) | 64.9 | 68.5 | 15.5 | 34.4
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) | 1.2 | 0.7 | 2.2 | 1.4
Settlement charge | 0.0 | (3.7) | 0.0 | (3.7)
Less: Tax effect | (0.4) | (1.8) | (0.7) | (1.9)
Net income (loss) | $ 0.8 | $ 2.6 | $ 1.5 | $ 3.2

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