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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,261.3 | $ 1,284.6 | $ 1,272.8 | $ 1,320.8
Other comprehensive income (loss) before reclassifications | (2.3) | 1.7 | (0.4) | (2.0)
Amortization of gains and losses, net of tax | 0.3 | 0.2 | 0.8 | 0.6
Postretirement benefit plan remeasurement (net of tax of $0.7) |  |  |  | 2.0
Amortization of prior service credit | 0.0 | 0.0 | (0.1) | (0.1)
Other reclassifications (net of tax of $0) |  |  |  | 0.6
Other comprehensive income (loss) | (2.0) | 1.9 | 0.3 | 1.1
Ending Balance | 1,199.3 | 1,269.1 | 1,199.3 | 1,269.1
Amortization, Tax | 0.0 | 0.0 | 0.0 | 0.0
Postretirement benefit plan remeasurement, tax | 0.8 |  | 0.0 |
Amortization of prior service credit, Tax | 0.0 | 0.0 | 0.0 | 0.0
Other reclassifications, tax | 0.0 | 0.0 |  | 0.0
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (57.4) | (56.5) | (59.7) | (55.7)
Ending Balance | (59.4) | (54.6) | (59.4) | (54.6)
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (45.2) | (45.6) | (47.1) | (41.9)
Other comprehensive income (loss) before reclassifications | (2.3) | 1.7 | (0.4) | (2.0)
Other comprehensive income (loss) | (2.3) | 1.7 | (0.4) | (2.0)
Ending Balance | (47.5) | (43.9) | (47.5) | (43.9)
Retirement benefit plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (12.2) | (10.9) | (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 | 0.8 | 0.6
Postretirement benefit plan remeasurement (net of tax of $0.7) |  |  |  | 2.0
Amortization of prior service credit | 0.0 | 0.0 | (0.1) | (0.1)
Other reclassifications (net of tax of $0) |  |  |  | 0.6
Other comprehensive income (loss) | 0.3 | 0.2 | 0.7 | 3.1
Ending Balance | $ (11.9) | $ (10.7) | $ (11.9) | $ (10.7)

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