Credit transaction, net (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 28, 2017	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Reversal of allowance on receivables sold			$ (30.9)	$ 0.0	$ 0.0
Credit transaction, net			$ 1.3	0.0	0.0
Initial credit term (years)			7 years
Credit renewal term (years)			2 years
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Reversal of allowance on receivables sold			$ 20.7	$ 0.0	$ 0.0
Sterling Jewelers, Inc. | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Net proceeds	$ 952.5
Beneficial interest asset	$ 10.2
Securitization Facility
Financing Receivable, Allowance for Credit Losses [Line Items]
Credit transaction, net			(29.6)
Repayments of secured debt			$ 600.0
Genesis Financial Solution
Financing Receivable, Allowance for Credit Losses [Line Items]
Servicing agreement, term (years)	5 years
Scenario, Forecast
Financing Receivable, Allowance for Credit Losses [Line Items]
Gain (loss) on held-for-investment finance receivables transferred to held-for-sale		$ 140.0