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Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019
Pension Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) | $ 0.6 | $ 1.0 | $ 0.8
Postretirement Benefits |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) | (0.5) | (0.2) | (0.1)
Net amortization and deferrals | Pension Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net actuarial loss (gain) |  | 0.0 | 0.0
Net amortization and deferrals | Postretirement Benefits |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net actuarial loss (gain) |  | (0.2) | (0.1)
Recognized net actuarial loss |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) | 0.6 | 1.0 |
Amortization of prior service (credit) cost | (0.5) | (0.2) |
Recognized net actuarial loss | Pension Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net actuarial loss (gain) |  | 1.0 | 0.8
Amounts reclassified from Accumulated other comprehensive income (loss) | 0.6 | 1.0 |
Amortization of prior service (credit) cost | 0.0 | 0.0 |
Recognized net actuarial loss | Postretirement Benefits |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net actuarial loss (gain) |  | 0.0 | 0.0
Amounts reclassified from Accumulated other comprehensive income (loss) | 0.0 | 0.0 |
Amortization of prior service (credit) cost | (0.5) | (0.2) |
Accumulated Defined Benefit Plans Adjustment | Pension Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Tax (benefit) expense | 0.0 | 0.0 | 0.0
Accumulated Defined Benefit Plans Adjustment | Postretirement Benefits |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Tax (benefit) expense | 0.1 | $ 0.0 | $ 0.0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Pension Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net actuarial loss (gain) | 0.6 |  |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Postretirement Benefits |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net actuarial loss (gain) | 0.0 |  |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest | Pension Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net actuarial loss (gain) | 0.0 |  |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest | Postretirement Benefits |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net actuarial loss (gain) | $ (0.6) |  |

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