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Share based compensation - Narrative (Details) - USD ($) $ in Millions |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2020 | Sep. 04, 2019 | Aug. 23, 2019 | Sep. 04, 2018 | Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 26, 2019 | Aug. 16, 2018 | Jul. 02, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  | 11,111,111
Compensation cost for non-vested awards not yet recognized |  |  |  |  |  |  | $ 0.0 | $ 9.0 |  |  |
Share-based compensation expense | $ 0.5 |  |  |  | $ 0.0 | $ 9.0 | $ 8.0 | $ 5.0 |  |  |
Company Directors and Senior Management |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ 0.2 |  |  |  |  |  |  |  |  |  |
Employee incentive plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  |  |  | 11,100,000 |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage vested |  |  | 33.00% | 33.00% |  |  |  |  |  |  |
Vesting period |  |  | 3 years | 3 years |  |  |  |  |  |  |
Shares vested in period (in shares) |  | 200,000 |  |  |  |  |  |  |  |  |
Restricted Stock Units | Company Directors and Senior Management |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 188,369 |  |  |  |  |  |  |  |  |  |
Restricted Stock Units | Employee incentive plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  | 300,000 | 500,000 |  |  |  |  |  |  |
Performance Shares | Company Directors and Senior Management |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 510,234 |  |  |  |  |  |  |  |  |  |
Performance Shares | Employee incentive plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  |  | 1,700,000 |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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