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Credit transaction, net - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2018 | May 31, 2018 | Mar. 31, 2018 | Oct. 28, 2017 | Aug. 04, 2018 | Jul. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017 | Feb. 03, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit transaction, net |  |  |  |  | $ (23.9) | $ 14.8 | $ (167.0) | $ 14.8 |
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% |  |  |  |  |  |
Reversal of allowance on receivables previously held for sale |  |  |  |  |  |  | 160.4 | $ (20.7) |
Proceeds from sale of in-house finance receivables | $ 445.5 |  |  |  |  |  | 445.5 | 0.0 |
Other |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Transaction-related costs |  |  |  |  | 4.5 |  | 6.6 |  |
Securitization Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  |  |  |  | $ 600.0
Consumer Portfolio Segment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Reversal of allowance on receivables previously held for sale |  |  |  |  |  |  | 107.6 | $ 20.7 |
Consumer Portfolio Segment | Sterling Jewelers |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Reversal of allowance on receivables previously held for sale |  |  |  |  | (19.4) |  | (160.4) |  |
Consumer Portfolio Segment | Other |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Transaction-related costs |  |  |  |  | $ 4.5 |  | $ 6.6 |  |
Sterling Jewelers, Inc. | Consumer Portfolio Segment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds |  |  |  | $ 952.5 |  |  |  |  |
Genesis Financial Solution |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Servicing agreement, term (years) |  |  |  | 5 years |  |  |  |  |

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- Definition The gains (losses) included in earning that represent the difference between the sale price and the carrying value of consumer loans. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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