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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