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Related Party Transactions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021
Class A Common Shares
Related Party Transaction
Common stock, shares outstanding (in shares)		352,881,826	337,362,716
Class B common shares
Related Party Transaction
Common stock, shares outstanding (in shares)		635,075	635,075
Affiliates
Related Party Transaction
Percent of shares held		23.90%	24.80%
Affiliates | American Homes 4 Rent, L.P.
Related Party Transaction
Due from affiliates		$ 25.7	$ 25.7
Affiliates | Class A Common Shares
Related Party Transaction
Percent of shares held		12.90%	13.50%
Affiliates | Class B common shares
Related Party Transaction
Common stock, shares outstanding (in shares)		635,075	635,075
Affiliates | Class A Common Units
Related Party Transaction
Common stock, shares outstanding (in shares)		50,622,165	50,622,165
Former Employee
Related Party Transaction
Settlement with related party	$ 2.9

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