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Redeemable preferred shares - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 20, 2024 | May 06, 2024 | Apr. 15, 2024 | Apr. 01, 2024 | Oct. 05, 2016 | Aug. 03, 2024 | May 04, 2024 | Jul. 29, 2023 | Aug. 03, 2024 | Aug. 03, 2024 | Jul. 29, 2023 | Feb. 03, 2024
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of redeemable convertible preferred shares |  |  |  |  |  |  |  |  |  | $ 541.0 | $ 0.0 |
Dividends paid on redeemable convertible preferred shares |  |  |  |  |  |  |  |  |  | $ 14.4 | 16.4 |
Redemption of preferred shares |  |  |  |  |  | $ 23.9 | $ 87.2 |  |  |  |  |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares issued (in shares) |  |  |  |  | 625,000 |  |  |  |  |  |  |
Preferred stock, purchase price |  |  |  |  | $ 625.0 |  |  |  |  |  |  |
Shares issued, price per share (usd per share) |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Temporary Equity, Redemption Price Per Share |  |  |  |  |  | $ 1,050.94 |  |  | $ 1,050.94 | $ 1,050.94 |  |
Preferred share conversion restriction |  |  |  |  |  |  |  |  | $ 110.0 |  |  |
Stock Redeemed or Called During Period, Shares |  | 100,000 |  | 312,500 |  |  |  |  |  |  |  |
Repurchase of redeemable convertible preferred shares | $ 129.0 |  | $ 414.1 |  |  |  |  |  |  |  |  |
Dividends paid on redeemable convertible preferred shares |  |  | 2.1 |  |  |  |  |  |  |  |  |
Redemption of preferred shares | $ 23.9 |  | $ 83.6 |  |  |  |  |  |  |  |  |
Professional Fees |  |  |  |  |  |  | $ 1.5 |  |  |  |  |
Payments of stock issuance costs |  |  |  |  | $ 13.7 |  |  |  |  |  |  |
Accumulated accretion of dividends |  |  |  |  |  | $ 13.5 |  | $ 11.5 | $ 13.5 | $ 13.5 | 11.5 | $ 12.4
Accretion to redemption value |  |  |  |  |  | $ 0.2 |  | $ 0.4 |  | $ 1.1 | $ 0.8 |

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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480408/260-10-S99-2 + Details
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- Definition Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480244/480-10-S99-1 + Details
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