v3.5.0.2

STOCKHOLDERS' EQUITY - Capital Stock (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 28, 2016 | Sep. 30, 2016
Business Acquisition [Line Items] |  |
Issuance of common stock, shares |  | 18,566,822
Proceeds for the issuance of common stock |  | $ 1,300.0
Equity offering program, remaining authorized offering amount |  | 252.1
Conversion of stock, value redeemed |  | $ 23.0
Common Stock |  |
Business Acquisition [Line Items] |  |
Conversion of stock, number of Ventas shares issued |  | 370,558
Ventas Realty OP Units |  |
Business Acquisition [Line Items] |  |
Partners' capital account, units, redeemed (in shares) |  | 65,581
Class C Units |  |
Business Acquisition [Line Items] |  |
Partners' capital account, units, redeemed (in shares) |  | 311,208
Subsequent Event |  |
Business Acquisition [Line Items] |  |
Issuance of common stock, shares | 297,019 |
Proceeds for the issuance of common stock | $ 21.2 |
Sales agent commissions for common stock sales | $ 0.3 |

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