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Long-Term Debt, Credit Agreement (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Apr. 18, 2018
Credit Agreement [Member] | Maximum [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Consolidated leverage ratio 2.25  
Credit Agreement [Member] | Minimum [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Consolidated interest coverage ratio 3.00  
Term Loan Facility [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Original principal amount $ 400.0 $ 400.0
Term of loan 5 years  
Frequency of payment quarterly  
Term Loan Facility [Member] | First Year [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Annual amortization percentage 5.00%  
Term Loan Facility [Member] | Second Year [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Annual amortization percentage 5.00%  
Term Loan Facility [Member] | Third Year [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Annual amortization percentage 7.50%  
Term Loan Facility [Member] | Fourth Year [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Annual amortization percentage 7.50%  
Term Loan Facility [Member] | Fifth Year [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Annual amortization percentage 10.00%  
Revolving Credit Facility [Member]    
Long-term Debt, Current and Noncurrent [Abstract]    
Borrowing capacity   $ 350.0
Term of loan 5 years