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Business Segment Reporting - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting [Abstract] |  |  |  |  |  |  |  |
Interest expense related to fund servicing advances and other servicing assets | $ 8.8 | $ 9.5 | $ 10.5 | $ 14.0 | $ 15.5 | $ 13.8 | $ 28.8 | $ 43.3

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- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- References No definition available. + Details
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