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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 14, 2018
Feb. 28, 2019
Feb. 28, 2019
May 31, 2018
Pension Plans | United States        
Employee Benefit Plans (Details) [Line Items]        
Lump sum benefit payments made       $ 37.8
Group annuity contracts acquired to settle benefit obligation $ 86.3      
Pretax plan settlement charges       $ 55.0
Pension Plans | United Kingdom        
Employee Benefit Plans (Details) [Line Items]        
Pension contributions     $ 0.8  
Contributions expected in current fiscal year   $ 1.1 1.1  
Post-Retirement Benefits        
Employee Benefit Plans (Details) [Line Items]        
Reduction in benefit obligation   2.7    
Reduction in AOCI   $ 2.7 $ 2.7  
Average remaining life expectancy     13 years