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Credit Transaction - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Oct. 31, 2017
Jul. 29, 2017
Jul. 30, 2016
Debt Instrument [Line Items]      
Reversal of allowance on receivables held for sale   $ (20.7) $ 0.0
Consumer Portfolio Segment      
Debt Instrument [Line Items]      
Reversal of allowance on receivables held for sale   20.7 $ 0.0
Sterling Jewelers, Inc. | Consumer Portfolio Segment      
Debt Instrument [Line Items]      
Loans receivables held for sale, amount   $ 1,000.0  
Forecast | Securitization Facility      
Debt Instrument [Line Items]      
Repayments of secured debt $ 600.0    
Forecast | Sterling Jewelers, Inc. | Consumer Portfolio Segment      
Debt Instrument [Line Items]      
Net proceeds $ 1,000.0