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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Nov. 15, 2021
Sep. 25, 2021
Revolving Credit Facility [Member]      
Fair Value of Financial Instrument Assumptions [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 550.0    
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    
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%    
Repurchase Agreement-Fourth Amendment to Second Amendment and Restated      
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