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Financing Activity - Subsequent Event (Details) - USD ($)
Oct. 16, 2020
Nov. 01, 2020
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Revolving Facilities     $ 375,000,000 $ 255,000,000
Bridge Facility        
Debt Instrument [Line Items]        
Revolving Facilities     22,500,000  
Credit Agreements | Bridge Facility        
Debt Instrument [Line Items]        
Revolving Facilities     $ 22,500,000  
Subsequent Event | Credit Agreements        
Debt Instrument [Line Items]        
Revolving Facilities   $ 896,500,000    
Subsequent Event | Credit Agreements | Bridge Facility        
Debt Instrument [Line Items]        
Increase in aggregate amount of commitments $ 25,000,000.0