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Redeemable preferred shares - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended			6 Months Ended	9 Months Ended
	Apr. 15, 2024	Apr. 01, 2024	Oct. 05, 2016	Nov. 02, 2024	Aug. 03, 2024	May 04, 2024	Nov. 02, 2024	Nov. 01, 2025	Nov. 02, 2024	Mar. 30, 2024
Temporary Equity [Line Items]
Repurchase of redeemable convertible preferred shares								$ 0.0	$ 812.9
Dividends paid on redeemable convertible preferred shares								$ 0.0	18.5
Redemption of preferred shares				$ 49.2	$ 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
Stock Redeemed or Called During Period, Shares		312,500					312,500
Repurchase of redeemable convertible preferred shares	$ 414.1						$ 401.5
Dividends paid on redeemable convertible preferred shares	2.1
Redemption of preferred shares	$ 83.6						71.8
Professional Fees						$ 1.6
Accrued Professional Fees				0.9			$ 0.9		0.9
Payments of stock issuance costs			$ 13.7
Accretion to redemption value				$ 0.2					$ 1.3