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Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015
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) | 0.0 | 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) | 0.0 | 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) | 1.6 | 3.0 |
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) | 1.3 | 1.4 |
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) | 0.3 | 1.6 |
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Service cost [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] | Service cost [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] | 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 | 0.1 | 0.2
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 | 0.0 | 0.0 | (4.3)
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 | (1.7) | (1.7) | (1.4)
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 | (0.4) | (2.8) | (1.3)
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 | 0.4 | 0.3 | 2.0
Amounts reclassified from Accumulated other comprehensive income (loss) | 1.3 | 1.4 | 3.7
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 | 0.1 | 1.1 | 0.4
Amounts reclassified from Accumulated other comprehensive income (loss) | $ 0.3 | $ 1.6 | $ 0.7

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