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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Jul. 18, 2021
Nov. 15, 2020
Sep. 25, 2020
Revolving Credit Facility [Member]        
Fair Value of Financial Instrument Assumptions [Line Items]        
Line of Credit Facility, Current Borrowing Capacity $ 500.0 $ 475.0    
Third Amendment to Credit Facility Initiation Date Jun. 30, 2020      
Line of Credit Facility, Maximum Borrowing Capacity $ 600.0      
Line of Credit Facility, Initiation Date Jul. 18, 2013      
Basis point spread on variable rate under Credit Facility 2.50%      
Warehousing Agreement - Fourth Amendment to Second Amended and Restated [Member]        
Fair Value of Financial Instrument Assumptions [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 125.0   $ 185.0 $ 160.0
Line of Credit Facility, Initiation Date Jun. 24, 2016      
Basis point spread on variable rate under Credit Facility 2.00%      
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