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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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