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Other Non-current Assets - Investments in Joint Ventures (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jun. 30, 2020
Jun. 30, 2011
Nov. 30, 2020
Feb. 28, 2021
May 31, 2020
License Fees          
Cumulative premiums paid         $ 15.6
Proceeds from termination of life insurance policy and reimbursement of prior tax payments     $ 10.0    
Net recoveries of prior taxes paid on behalf of employees     1.3    
Unison Industries          
License Fees          
Agreement period (in years)   10 years      
Payment of license fee $ 25.0        
License fee capitalized $ 25.0        
Owned Through Joint Ventures          
Investments in Joint Ventures          
Investments in joint ventures       $ 9.9  
Membership interest in joint ventures (as a percent)       40.00%  
Amount of guarantee liability recognized       $ 8.4  
Percentage on outstanding debt       40.00%  
Loan to joint venture       $ 3.1  
License Fees          
Proceeds from termination of life insurance policy and reimbursement of prior tax payments     $ 12.0