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Commitments and Contingencies - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
single_family_property
Dec. 31, 2018
USD ($)
single_family_property
Dec. 31, 2017
USD ($)
Commitments and contingencies      
Number of real estate properties held-for-sale in escrow | single_family_property 305 78  
Expected proceeds from sale of property held-for-sale $ 57.5 $ 13.6  
Company contributions 1.6 1.3 $ 0.9
Single Family      
Commitments and contingencies      
Third party development agreements and land 75.1 25.3  
Land      
Commitments and contingencies      
Third party development agreements and land $ 44.3 $ 58.1  
Commitment to acquire properties      
Commitments and contingencies      
Number of properties | single_family_property 289 88  
Surety Bond      
Commitments and contingencies      
Current carrying value $ 14.5 $ 5.1  
Minimum      
Commitments and contingencies      
Remaining Term of Contract 1 year    
Maximum      
Commitments and contingencies      
Remaining Term of Contract 5 years