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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance at December 1, 2016 $ (80.9) $ (92.3) $ (94.2) $ (86.7)
Other comprehensive income (loss) before reclassifications (net of tax) 2.2 0.9 6.0 (6.1)
Amortization (net of tax of $0.1) 0.5 0.7 1.4 2.1
Settlement (net of tax of $15.8) 23.8   33.0  
Other reclassifications (net of tax benefit of $1.4) (2.1)   (2.7)  
Other comprehensive income (loss) 24.4 1.6 37.7 (4.0)
Ending balance at February 28, 2017 (56.5) (90.7) (56.5) (90.7)
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance at December 1, 2016 (41.5) (47.0) (45.3) (40.0)
Other comprehensive income (loss) before reclassifications (net of tax) 2.2 0.9 6.0 (6.1)
Other comprehensive income (loss) 2.2 0.9 6.0 (6.1)
Ending balance at February 28, 2017 (39.3) (46.1) (39.3) (46.1)
Retirement benefit plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance at December 1, 2016 (39.4) (45.3) (48.9) (46.7)
Other comprehensive income (loss) before reclassifications (net of tax) 0.0 0.0 0.0 0.0
Amortization (net of tax of $0.1) 0.5 0.7 1.4 2.1
Settlement (net of tax of $15.8) 23.8   33.0  
Other reclassifications (net of tax benefit of $1.4) (2.1)   (2.7)  
Other comprehensive income (loss) 22.2 0.7 31.7 2.1
Ending balance at February 28, 2017 (17.2) (44.6) (17.2) (44.6)
Amortization, Tax 0.1 $ 0.3 0.4 $ 1.0
Settlement, Tax 15.8   22.0  
Other reclassifications, Tax $ 1.4   $ 1.9