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Basis and Summary of Significant Accounting Policies - Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 21, 2020
Debt Instrument [Line Items]        
Debt issuance costs, net   $ 1,100,000    
Proceeds from lines of credit   300,000,000.0    
Goodwill   $ 186,200,000    
Revolving Credit Facility | Credit Facility        
Debt Instrument [Line Items]        
Line of credit, maximum borrowing capacity     $ 400,000,000.0  
Subsequent Event        
Debt Instrument [Line Items]        
Repayments of lines of credit $ 300,000,000.0      
Goodwill $ 486,200,000      
Subsequent Event | Revolving Credit Facility | Credit Facility        
Debt Instrument [Line Items]        
Line of credit, maximum borrowing capacity       $ 500,000,000.0
Term Loan | Unsecured Debt        
Debt Instrument [Line Items]        
Line of credit, maximum borrowing capacity     225,000,000.0  
Debt instrument, periodic payment     $ 5,600,000