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Debt - Narrative (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
debtInstrumentExtensionOption
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2015
USD ($)
singleFamilyProperty
Mar. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
property
Sep. 30, 2014
USD ($)
property
Dec. 31, 2021
USD ($)
singleFamilyProperty
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2021
USD ($)
Debt Instrument [Line Items]                        
Loan payoff amount                 $ 24,311,000 $ 22,501,000 $ 21,517,000  
Debt outstanding                 3,924,181,000 2,848,492,000    
Proceeds from unsecured senior notes, net of discount                 737,195,000 0 397,944,000  
Deferred financing costs, net                 28,142,000 27,422,000    
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Payments on credit facility                 $ 1,060,000,000 130,000,000 250,000,000  
Single Family Homes                        
Debt Instrument [Line Items]                        
Number of properties | singleFamilyProperty                 57,024      
Term loan facility, net                        
Debt Instrument [Line Items]                        
Payments on credit facility                 $ 0 0 100,000,000  
Secured Debt                        
Debt Instrument [Line Items]                        
Minimum coverage ratio                 1.20      
Debt outstanding                 $ 1,924,181,000 1,948,492,000    
Secured Debt | Asset Backed Securitizations September 2014 Securitization | Single Family Homes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount               $ 513,300,000        
Debt instrument term               10 years        
Weighted-average interest rate               4.42%        
Number of properties | property               4,487        
Loan payoff amount               $ 25,700,000        
Proceeds from asset-backed securitizations               487,700,000        
Debt issuance cost               $ 12,900,000        
Secured Debt | Asset Backed Securitizations November 2014 Securitization | Single Family Homes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount             $ 528,400,000          
Debt instrument term             10 years          
Weighted-average interest rate             4.40%          
Number of properties | property             4,503          
Proceeds from asset-backed securitizations             $ 528,400,000          
Debt issuance cost             $ 12,900,000          
Secured Debt | Asset Backed Securitizations March 2015 Securitization | Single Family Homes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount           $ 552,800,000            
Debt instrument term           30 years            
Weighted-average interest rate           4.14%            
Number of properties | property           4,661            
Proceeds from asset-backed securitizations           $ 552,800,000            
Debt issuance cost           $ 13,300,000            
Secured Debt | Asset Backed Securitizations September 2015 Securitization | Single Family Homes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount         $ 477,700,000              
Debt instrument term         30 years              
Weighted-average interest rate         4.36%              
Number of properties | singleFamilyProperty         4,125              
Proceeds from asset-backed securitizations         $ 477,700,000              
Debt issuance cost         $ 11,300,000              
Senior notes | Designated as Hedging Instrument | Treasury Lock                        
Debt Instrument [Line Items]                        
Effective interest rate       4.08%                
Senior notes | 2031 unsecured senior notes, net                        
Debt Instrument [Line Items]                        
Debt outstanding                 $ 450,000,000 0    
Interest rate 2.375%               2.38%      
Redeemable percentage of debt 100.00%                      
Effective interest rate                 2.46%      
Senior notes | 2051 unsecured senior notes, net                        
Debt Instrument [Line Items]                        
Debt outstanding                 $ 300,000,000 0    
Interest rate 3.375%               3.38%      
Redeemable percentage of debt 100.00%                      
Senior notes | Senior Unsecured Notes                        
Debt Instrument [Line Items]                        
Proceeds from unsecured senior notes, net of discount $ 731,600,000                      
Underwriting fees 5,600,000                      
Unamortized discount on debt 12,800,000                      
Deferred financing costs, net $ 1,400,000                      
Senior notes | 4.90 Percent Senior Notes Due 2029                        
Debt Instrument [Line Items]                        
Debt instrument, face amount     $ 400,000,000                  
Debt outstanding                 $ 400,000,000 400,000,000    
Interest rate     4.90%           4.90%      
Proceeds from unsecured senior notes, net of discount     $ 395,300,000                  
Underwriting fees     2,600,000                  
Unamortized discount on debt     2,100,000                  
Deferred financing costs, net     $ 1,000,000                  
Redeemable percentage of debt     100.00%                  
Senior notes | 4.25 Percent Senior Notes Due 2028                        
Debt Instrument [Line Items]                        
Debt instrument, face amount       $ 500,000,000                
Debt outstanding                 $ 500,000,000 500,000,000    
Interest rate       4.25%         4.25%      
Proceeds from unsecured senior notes, net of discount       $ 494,000,000                
Underwriting fees       3,200,000                
Unamortized discount on debt       2,800,000                
Deferred financing costs, net       $ 1,900,000                
Redeemable percentage of debt       100.00%                
Effective interest rate                 4.08%      
Line of Credit | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Debt outstanding                 $ 350,000,000 $ 0    
Interest rate                 1.20%      
Credit facility maximum borrowing capacity   $ 1,250,000,000             $ 1,250,000,000     $ 800,000,000
Number of debt instrument extension options | debtInstrumentExtensionOption   2                    
Line of credit extension period   6 months                    
Line of Credit | Revolving Credit Facility | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate                 1.10%      
Debt instrument, basis spread on base rate   1.00%                    
Line of Credit | Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate                        
Debt Instrument [Line Items]                        
Debt instrument, basis spread on base rate   0.50%                    
Line of Credit | Revolving Credit Facility | Minimum                        
Debt Instrument [Line Items]                        
Commitment fee                 0.125%      
Line of Credit | Revolving Credit Facility | Minimum | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   0.725%                    
Line of Credit | Revolving Credit Facility | Minimum | Base Rate                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   0.00%                    
Line of Credit | Revolving Credit Facility | Maximum                        
Debt Instrument [Line Items]                        
Commitment fee                 0.30%      
Line of Credit | Revolving Credit Facility | Maximum | LIBOR                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   1.45%                    
Line of Credit | Revolving Credit Facility | Maximum | Base Rate                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   0.45%                    
Line of Credit | Term loan facility, net                        
Debt Instrument [Line Items]                        
Payments on credit facility                     100,000,000  
Write off of deferred debt issuance costs                     $ 700,000