Shareholders' equity - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		87 Months Ended
	May 03, 2025	May 04, 2024	May 03, 2025	Feb. 01, 2025	Mar. 30, 2024
Class of Stock [Line Items]
Amount repurchased	$ 117.4	$ 7.4
2017 Program
Class of Stock [Line Items]
Stock Repurchase Program, Increase to Authorized Amount					$ 200.0
Stock repurchase program, authorized amount				$ 2,100.0
Remaining authorized repurchase amount	605.6		$ 605.6	$ 723.0
Amount repurchased	$ 117.4	$ 7.4	$ 1,500.0