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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Nov. 15, 2021
Sep. 25, 2021
Mar. 31, 2021
Revolving Credit Facility [Member]        
Fair Value of Financial Instrument Assumptions [Line Items]        
Line of Credit Facility, Current Borrowing Capacity $ 550.0     $ 500.0
Line of Credit Facility, Maximum Borrowing Capacity $ 700.0      
Line of Credit Facility, Initiation Date Jul. 18, 2013      
Basis point spread on variable rate under Credit Facility 1.75%      
Fourth Amendment to Credit Facility Initiation Date Jun. 10, 2021      
Repurchase Agreement-Third Amendment to Second Amendment and Restated [Member]        
Fair Value of Financial Instrument Assumptions [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 90.0      
Line of Credit Facility, Initiation Date Oct. 30, 2017      
Warehousing Agreement - Fifth Amendment to Second Amended and Restated        
Fair Value of Financial Instrument Assumptions [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 175.0 $ 235.0 $ 210.0  
Line of Credit Facility, Initiation Date Jun. 24, 2016      
Basis point spread on variable rate under Credit Facility 1.90%