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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020 | Aug. 31, 2021 | May 31, 2021 | Aug. 31, 2020 | May 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 1,210.0 | $ 1,187.9 | $ 1,210.0 | $ 1,187.9 | $ 1,149.6 | $ 1,182.3 | $ 1,147.4 | $ 1,180.6
Other comprehensive income (loss) before reclassifications | (3.9) | 5.7 | (9.7) | 16.4 |  |  |  |
Amortization of gains and losses, net of tax | 0.2 | 0.2 | 0.4 | 0.3 |  |  |  |
Amortization of prior service (credit) cost (net of tax of $0.0) | (0.2) | (0.1) | (0.3) | (0.1) |  |  |  |
Other comprehensive income (loss) | (3.9) | 5.8 | (9.6) | 16.6 |  |  |  |
Ending balance | 1,210.0 | 1,187.9 | 1,210.0 | 1,187.9 | 1,149.6 | 1,182.3 | 1,147.4 | 1,180.6
Amortization, Tax | (0.0) | (0.0) | (0.0) | (0.0) |  |  |  |
Amortization of prior service credit, Tax | 0.0 | 0.1 | 0.1 | 0.1 |  |  |  |
Accumulated other comprehensive income (loss) | (44.3) | (41.7) | (44.3) | (41.7) |  | (34.7) |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (44.3) | (41.7) | (44.3) | (41.7) | (40.4) | (34.7) | (47.5) | (58.3)
Ending balance | (44.3) | (41.7) | (44.3) | (41.7) | (40.4) | (34.7) | (47.5) | (58.3)
Accumulated other comprehensive income (loss) | (44.3) | (41.7) | (44.3) | (41.7) | (40.4) | (34.7) | (47.5) | (58.3)
Foreign currency translation adjustments |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (4.4) | 0.4 | (10.2) | 11.1 |  |  |  |
Amortization of gains and losses, net of tax | 0.0 | 0.0 |  | 0.0 |  |  |  |
Amortization of prior service (credit) cost (net of tax of $0.0) | 0.0 | 0.0 |  | 0.0 |  |  |  |
Other comprehensive income (loss) | (4.4) | 0.4 | (10.2) | 11.1 |  |  |  |
Accumulated other comprehensive income (loss) | (40.3) | (38.9) | (40.3) | (38.9) | (35.9) | (30.1) | (39.3) | (50.0)
Retirement benefit plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 0.5 | 5.3 | 0.5 | 5.3 |  |  |  |
Amortization of gains and losses, net of tax | 0.2 | 0.2 | 0.4 | 0.3 |  |  |  |
Amortization of prior service (credit) cost (net of tax of $0.0) | (0.2) | (0.1) | (0.3) | (0.1) |  |  |  |
Other comprehensive income (loss) | 0.5 | 5.4 | 0.6 | 5.5 |  |  |  |
Accumulated other comprehensive income (loss) | $ (4.0) | $ (2.8) | $ (4.0) | $ (2.8) | $ (4.5) | $ (4.6) | $ (8.2) | $ (8.3)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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