Credit transaction, net (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Jun. 30, 2018	May 31, 2018	Oct. 28, 2017	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Reversal of allowance on receivables sold(1)				$ 160.4	$ (30.9)	$ 0.0
Credit transaction, net				$ (167.4)	1.3	0.0
Initial credit term (years)				7 years
Credit renewal term (years)				2 years
Percentage of eligible receivables purchased		30.00%
Sale of receivables, percentage of par	72.00%
Sale of receivables, percentage settled in cash	95.00%
Sale of receivables.percentage deferred until second anniversary				5.00%
Proceeds from sale of in-house finance receivables	$ 445.5			$ 445.5	952.5	0.0
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Reversal of allowance on receivables sold(1)				107.6	20.7	$ 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
Sterling Jewelers | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Reversal of allowance on receivables sold(1)				160.4	10.2
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Transaction costs				7.0
Other | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Transaction costs				$ 7.0	$ (29.6)