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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Less: Tax effect $ 14.1 $ 8.4 $ 17.4 $ (10.8)
Net income (loss) (49.2) (15.4) (55.8) 12.9
Amount reclassified from Accumulated other comprehensive income (loss) | Retirement benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of unrecognized gain (loss) 0.6 1.0 1.8 3.1
Settlement charge 39.6 0.0 55.0 0.0
Other reclassifications, net (3.4) 0.0 (4.6) 0.0
Less: Tax effect (14.6) (0.3) (20.6) (1.0)
Net income (loss) $ 22.2 $ 0.7 $ 31.6 $ 2.1