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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2019
Nov. 30, 2018
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Jun. 01, 2018
May 31, 2018
Contract Assets and Liabilities              
Contract assets - current $ 54.9     $ 54.9   $ 49.6  
Contract assets - non-current 15.7     15.7   12.9  
Contract liabilities - current (8.3)     (8.3)   (9.4)  
Contract liabilities - non-current (89.0)     (89.0)   (35.8)  
Net contract assets (liabilities) (26.7)     (26.7)   $ 17.3  
Change in contract assets - current       5.3      
Change in contract assets - noncurrent       2.8      
Change in contract liabilities - current       1.1      
Change in contract liabilities - non-current       (53.2)      
Change in net contract assets       (44.0)      
Provision for doubtful accounts 0.7 $ 12.4 $ 0.1 13.7 $ 0.4    
Impairment of non-current contract assets   7.6          
Allowance for doubtful accounts   3.3          
Other liabilities $ 21.3 $ 1.5   $ 21.3     $ 26.4