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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