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Shareholders’ equity - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 03, 2022 | Nov. 04, 2021 | Oct. 08, 2021 | Mar. 04, 2021 | Oct. 22, 2020 | Aug. 07, 2020 | Jan. 10, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 1,164,000 |  | 1,164,000 |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 3 years |  |  |  |  |  |  |  |
Common Shares | Jan 2020 Registration Stmt |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement |  |  |  |  |  |  |  |  |  |  | $ 150.0
Common Shares | Oct 2020 Registration Stmt |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement |  |  |  |  |  |  |  |  | $ 200.0 |  |
Common Shares | Nov 2021 Registration Stmt |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement |  |  |  |  |  | $ 250.0 |  |  |  |  |
Jefferies LLC | Common Shares | Sale Agreement |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued under agreement (in sales) | 1,790,546 | 69,048 | 9,214,168 | 69,048 |  |  |  |  |  |  |
Proceeds from issuance of shares under the agreement | $ 4.7 | $ 0.3 | $ 24.6 | $ 0.3 |  |  |  |  |  |  |
Jefferies LLC | Common Shares | Mar 2021 Prospectus Supplement Agreement | Oct 2020 Registration Stmt |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement |  |  |  |  |  |  |  | $ 75.0 |  |  |
Jefferies LLC | Common Shares | October 2021 Prospectus Supplement |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement | 105.8 |  | 105.8 |  |  |  |  |  |  |  |
Jefferies LLC | Common Shares | October 2021 Prospectus Supplement | Oct 2020 Registration Stmt |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement |  |  |  |  |  |  | $ 75.0 |  |  |  |
Jefferies LLC | Common Shares | March 2022 Prospectus Supplement |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement | $ 105.8 |  | $ 105.8 |  |  |  |  |  |  |  |
Jefferies LLC | Common Shares | March 2022 Prospectus Supplement | Jan 2020 Oct 2020 and Nov 2021 Registration Stmts |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement |  |  |  |  | $ 100.0 |  |  |  |  |  |
Jefferies LLC | Common Shares | Jan 2020 Prospectus Supplement | Jan 2020 Registration Stmt |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement |  |  |  |  |  |  |  |  |  |  | $ 50.0
Jefferies LLC | Common Shares | Aug 2020 Prospectus Supplement | Jan 2020 Registration Stmt |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price of common shares under agreement |  |  |  |  |  |  |  |  |  | $ 75.0 |

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