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Taxes (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2019
USD ($)
Feb. 28, 2019
USD ($)
Nov. 30, 2018
USD ($)
Feb. 28, 2019
USD ($)
Feb. 28, 2018
USD ($)
May 31, 2019
USD ($)
state
May 31, 2018
USD ($)
May 31, 2017
USD ($)
May 31, 2016
USD ($)
Income Tax And Non Income Tax Disclosure [Abstract]                  
Settlements during the period           $ 0.2 $ 1.9 $ 0.6  
Net deferred tax assets $ 37.0         37.0 25.2    
Decrease in deferred tax asset valuation allowance           (0.6)      
Valuation Allowance, Deferred Tax Asset, Decrease, Valuation Amount       $ 3.9 $ 1.9        
Valuation Allowance, Deferred Tax Asset, Decrease, Releases Amount       $ 3.3 $ 1.3        
Valuation Allowance, Deferred Tax Asset, Increase, Amount             0.3    
Unrecognized tax benefits 9.0         9.0 10.1 14.1 $ 17.9
Income tax penalties and interest accrued 0.0         0.0 1.8 1.7  
Unrecognized tax benefits that would impact effective tax rate 0.0         0.0 10.1 0.0  
Tax (expense) benefit from income tax penalties and interest expense           0.4 (0.1) (0.6)  
Period increase (decrease) in unrecognized tax benefits           (1.1) (4.0)    
Loss Contingencies [Line Items]                  
Tax Cuts and Jobs Act, Remeasurement 0.3                
Tax Cuts and Jobs Act, Equity Compensation Disallowed     $ 0.2            
Tax Cuts and Jobs Act, Global Intangible Low-Taxed Income, Income Tax Expense           0.9      
Operating Loss Carryforwards, Valuation Allowance $ 60.0         60.0 117.4    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest             (1.5)    
Earnings (loss) from continuing operations before income taxes           26.0 (1.5) 87.9  
Remeasurement expense             5.7    
Provision (benefit) for income taxes           10.4 3.5 35.4  
Tax Adjustments, Settlements, and Unusual Provisions   $ 0.5              
State Sales Tax Assessment [Member] | Wisconsin [Member]                  
Loss Contingencies [Line Items]                  
Provision (benefit) for income taxes           $ 8.1      
Pension Plans [Member] | U.S. [Member]                  
Loss Contingencies [Line Items]                  
Settlement charge             $ 57.3 $ 0.0  
Book Clubs                  
Income Tax And Non Income Tax Disclosure [Abstract]                  
States with sales tax remitted (in states) | state           39