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Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2016 | May 31, 2015 | May 31, 2014
Service cost [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts reclassified from Accumulated other comprehensive income (loss) | $ 0.0 | $ (0.2) |
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 | (0.2) |
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 | 2.6 |
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 | 2.6 |
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) | 3.0 | 1.9 |
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) | 1.4 | 1.1 |
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) | 1.6 | 0.8 |
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 | 0.1 | 0.2 | 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 | (4.3) | (1.7)
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) | (1.4) | (1.8)
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 | (2.8) | (1.3) | (2.2)
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 | 0.3 | 2.0 | 1.4
Amounts reclassified from Accumulated other comprehensive income (loss) | 1.4 | 3.7 | 2.1
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 | 1.1 | 0.4 | 0.8
Amounts reclassified from Accumulated other comprehensive income (loss) | $ 1.6 | $ 0.7 | $ 1.2

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