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Warranty reserve - Warranty reserve rollforward (Details) - USD ($) $ in Millions	Oct. 31, 2015	Aug. 01, 2015	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	Feb. 01, 2014
Product Warranty Liability [Line Items]
Product Warranty Accrual	$ 42.5	$ 43.1	$ 44.9	$ 46.7	$ 48.1	$ 19.1
Current liabilities
Product Warranty Liability [Line Items]
Product Warranty Accrual, Current	17.8		17.2	17.6
Non-current liabilities
Product Warranty Liability [Line Items]
Product Warranty Accrual, Noncurrent	$ 24.7		$ 27.7	$ 29.1