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Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2018 | May 31, 2018 | May 31, 2017 | May 31, 2016
Postretirement Benefits [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Settlement charge |  | $ 0.0 | $ 0.0 | $ 0.0
Service cost [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 0.0 | 0.0 |
Service cost [Member] | Pension Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 0.0 | 0.0 |
Service cost [Member] | Postretirement Benefits [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 0.0 | 0.0 |
Lump sum settlement charge [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 33.0 | 0.0 |
Lump sum settlement charge [Member] | Pension Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 33.0 | 0.0 |
Lump sum settlement charge [Member] | Postretirement Benefits [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 0.0 | 0.0 |
Recognized net actuarial loss [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 1.9 | 1.6 |
Recognized net actuarial loss [Member] | Pension Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 1.8 | 1.3 |
Recognized net actuarial loss [Member] | Postretirement Benefits [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 0.1 | 0.3 |
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Net amortization and deferrals [Member] | Pension Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax |  | 0.0 | 0.0 | 0.0
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Net amortization and deferrals [Member] | Postretirement Benefits [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax |  | 0.0 | 0.0 | 0.1
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Lump sum settlement charge [Member] | Pension Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax |  | (55.0) | 0.0 | 0.0
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Lump sum settlement charge [Member] | Postretirement Benefits [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax |  | 0.0 | 0.0 | 0.0
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Recognized net actuarial loss [Member] | Pension Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax |  | (2.1) | (1.7) | (1.7)
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Recognized net actuarial loss [Member] | Postretirement Benefits [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax |  | (0.1) | (0.4) | (2.8)
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Pension Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax benefit |  | 22.3 | 0.4 | 0.3
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 34.8 | 1.3 | 1.4
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Postretirement Benefits [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax benefit |  | 0.0 | 0.1 | 1.1
Amounts reclassified from Accumulated other comprehensive income (loss) |  | 0.1 | 0.3 | 1.6
U.S. [Member] | Pension Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Settlement charge | $ (57.3) | $ (57.3) | $ 0.0 | $ 0.0

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