Cover Page |
Nov. 05, 2020 |
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| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 05, 2020 |
| Entity Registrant Name | Hannon Armstrong Sustainable Infrastructure Capital, Inc. |
| Entity Central Index Key | 0001561894 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | MD |
| Entity File Number | 001-35877 |
| Entity Tax Identification Number | 46-1347456 |
| Entity Address, Address Line One | 1906 Towne Centre Blvd |
| Entity Address, Address Line Two | Suite 370 |
| Entity Address, City or Town | Annapolis |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 21401 |
| City Area Code | 410 |
| Local Phone Number | 571-9860 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Trading Symbol | HASI |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
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