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Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 24 Months Ended | 33 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2020 | Jan. 04, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation charges | $ 4.6 |  | $ 3.4 |  | $ 13.3 | $ 12.2 |  |  |
Accelerated equity award vesting |  | $ 3.1 |  |  |  | 3.1 |  |  |
Unrecognized stock-based compensation expense | $ 25.3 |  |  |  | $ 25.3 |  |  | $ 25.3 |
Unrecognized stock-based compensation expense, period for recognition |  |  |  |  | 1 year 10 months 24 days |  |  |  |
Accelerated equity award vesting (in shares) |  |  |  | 100,000 |  |  |  |  |
Compensation from modification of awards |  |  |  | $ 2.9 |  |  |  |  |
Accelerated compensation from executive termination |  |  |  | $ 0.2 |  |  |  |  |
Fair value at grant date of stock option award |  |  |  |  | $ 0.6 | 0.4 |  |  |
Intrinsic value of options exercised |  |  |  |  | $ 8.2 | $ 27.5 |  |  |
Time-Based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  | 194,981 |  |  |  |
Market-Based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  | 108,810 |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average grant date fair value, awards granted (in USD per share) |  |  |  |  | $ 31.06 |  |  |  |
Weighted average grant date fair value, awards vested (in USD per share) |  |  |  |  | 20.93 |  |  |  |
Weighted average grant date fair value, awards forfeited (in USD per share) |  |  |  |  | 26.13 |  |  |  |
Weighted average grant date fair value, non-vested awards (in USD per share) | $ 24.32 |  |  |  | $ 24.32 |  | $ 22.50 | $ 24.32 |
OP units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Aggregate fair value of awards granted |  |  |  |  | $ 8.3 |  |  |  |
2010 Equity Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) | 3,849,976 |  |  |  | 3,849,976 |  |  | 3,849,976 |
Americold Realty Trust 2017 Equity Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  |  | 9,000,000
Dividends accrued on dividend equivalents on unvested units payable |  |  |  |  |  |  | $ 1.1 | $ 1.8 |
Trustees | Time-Based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  | 8,517 |  |  |  |
Vesting period |  |  |  |  | 1 year |  |  |  |
Trustees | Time-Based Restricted Stock Units, Awarded for Initial Public Offering |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  |  | 12,285 |  |  |
Vesting period |  |  |  |  |  | 1 year |  |  |
Trustees | Time-based Restricted Stock Units, Awarded As Part of Annual Compensation |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  |  | 5,982 |  |  |
Vesting period |  |  |  |  |  | 1 year |  |  |
Trustees | Restricted stock units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  | 5,982 |  | 8,517 | 18,267 |  |  |
Vesting period |  |  | 1 year |  | 1 year | 1 year |  |  |
Trustees | OP units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  | 20,190 |  | 16,325 | 20,190 |  |  |
Vesting period |  |  | 1 year |  | 1 year | 1 year |  |  |
Employees | Time-Based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  | 186,464 | 257,867 |  |  |
Employees | Market-Based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  | 108,810 | 243,168 |  |  |
Vesting period |  |  |  |  | 3 years | 3 years |  |  |
Employees | Restricted stock units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) | 10,608 |  | 10,489 |  | 295,274 | 501,035 |  |  |
Employees | OP units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  | 255,720 |  |  |  |
Employees | Minimum | Time-Based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year | 1 year |  |  |
Employees | Minimum | Restricted stock units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period | 1 year |  | 1 year |  | 1 year | 1 year |  |  |
Employees | Minimum | OP units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year |  |  |  |
Employees | Maximum | Time-Based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years | 3 years |  |  |
Employees | Maximum | Restricted stock units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period | 3 years |  | 3 years |  | 3 years | 3 years |  |  |
Employees | Maximum | OP units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |

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