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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, 2019 | Nov. 30, 2018 | Nov. 30, 2019 | Nov. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,196.7 | $ 1,209.4 | $ 1,272.8 | $ 1,320.8
Other comprehensive income (loss) before reclassifications | 3.9 | (0.6) | 1.9 | (3.7)
Amortization of gains and losses, net of tax | 0.3 | 0.2 | 0.5 | 0.4
Postretirement benefit plan remeasurement (net of tax of $0.7) |  | 2.0 |  | 2.0
Amortization of prior service credit | (0.1) | (0.1) | (0.1) | (0.1)
Other reclassifications (net of tax of $0) |  | 0.6 |  | 0.6
Other comprehensive income (loss) | 4.1 | 2.1 | 2.3 | (0.8)
Ending Balance | 1,261.3 | 1,284.6 | 1,261.3 | 1,284.6
Amortization, Tax | 0.0 | 0.0 | 0.0 | 0.0
Postretirement benefit plan remeasurement, tax | 0.7 |  | 0.7 |
Amortization of prior service credit, Tax | 0.0 | 0.0 | 0.0 | 0.0
Other reclassifications, tax | 0.2 | 0.2 |  | 0.2
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (61.5) | (58.6) | (59.7) | (55.7)
Ending Balance | (57.4) | (56.5) | (57.4) | (56.5)
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (49.1) | (45.0) | (47.1) | (41.9)
Other comprehensive income (loss) before reclassifications | 3.9 | (0.6) | 1.9 | (3.7)
Other comprehensive income (loss) | 3.9 | (0.6) | 1.9 | (3.7)
Ending Balance | (45.2) | (45.6) | (45.2) | (45.6)
Retirement benefit plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (12.4) | (13.6) | (12.6) | (13.8)
Other comprehensive income (loss) before reclassifications | 0.0 | 0.0 | 0.0 | 0.0
Amortization of gains and losses, net of tax | 0.3 | 0.2 | 0.5 | 0.4
Postretirement benefit plan remeasurement (net of tax of $0.7) |  | 2.0 |  | 2.0
Amortization of prior service credit | (0.1) | (0.1) | (0.1) | (0.1)
Other reclassifications (net of tax of $0) |  | 0.6 |  | 0.6
Other comprehensive income (loss) | 0.2 | 2.7 | 0.4 | 2.9
Ending Balance | $ (12.2) | $ (10.9) | $ (12.2) | $ (10.9)

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