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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, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | Feb. 28, 2019 | Feb. 28, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of prior service credit | $ 0.0 |  |  |  |  |  | $ (0.1) |
Less: Tax effect | 8.2 |  |  | $ 14.1 |  |  | 3.5 | $ 17.4
Net income (loss) | (12.6) | $ 71.6 | $ (61.3) | (49.2) | $ 57.1 | $ (63.7) | (2.3) | (55.8)
Retirement benefit plans |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of prior service credit | 0.0 |  |  |  |  |  | (0.1) |
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 |  |  | 0.6 | 1.8
Settlement charge | 0.0 |  |  | 39.6 |  |  | 0.0 | 55.0
Amortization of prior service credit |  |  |  |  |  |  | (0.1) |
Less: Tax effect | 0.0 |  |  | (15.9) |  |  | 0.0 | (22.4)
Net income (loss) | $ (0.2) |  |  | $ (24.3) |  |  | $ (0.5) | $ (34.4)

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- Definition Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax + References No definition available. + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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