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Debt (Details) - USD ($)
$ in Millions
Nov. 30, 2019
Jun. 01, 2019
Line of Credit Facility [Line Items]    
Long-term debt $ 275.0 $ 281.9
Long-term Construction Loan, Noncurrent 0.0 6.9
Finance Leased Assets, Gross   6.9
Syndicated revolving line of credit, due September 2021    
Line of Credit Facility [Line Items]    
Revolving line of credit, maximum borrowing capacity 500.0 400.0
Revolving line of credit, allowed increase in borrowing capacity 250.0 200.0
Long-term debt 225.0 225.0
Line of Credit Facility, Remaining Borrowing Capacity 265.5 165.0
Letters of Credit Outstanding, Amount $ 9.5 $ 10.0