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Other Non-current Assets - Investments in Joint Ventures (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2011
Nov. 30, 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     $ 9.7
Membership interest in joint ventures (as a percent)     40.00%
Amount of guarantee liability recognized     $ 8.5
Percentage on outstanding debt     40.00%
Loan to joint venture     $ 3.0
License Fees      
Proceeds from termination of life insurance policy and reimbursement of prior tax payments     $ 12.0