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Mortgage Servicing Rights and Related Liabilities - MSRs and Related Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Mortgage Servicing Rights [Line Items] |  |
Forward MSRs - fair value | $ 3,665.0 |
Mortgage servicing rights | 3,676.0 |
Mortgage servicing liabilities - amortized cost | 71.0 |
MSR related liabilities - nonrecourse | 1,216.0 |
Mortgage Servicing Rights |  |
Mortgage Servicing Rights [Line Items] |  |
Forward MSRs - fair value | 3,665.0 |
Reverse MSRs - amortized cost | 11.0 |
Mortgage servicing rights | 3,676.0 |
Mortgage servicing liabilities - amortized cost | 71.0 |
Mortgage Servicing Right Liability |  |
Mortgage Servicing Rights [Line Items] |  |
Excess spread financing - fair value | 1,184.0 |
Mortgage servicing rights financing - fair value | 32.0 |
MSR related liabilities - nonrecourse | $ 1,216.0 |
Predecessor |  |
Mortgage Servicing Rights [Line Items] |  |
Forward MSRs - fair value |  | $ 2,937.0
Mortgage servicing rights |  | 2,941.0
Mortgage servicing liabilities - amortized cost |  | 41.0
Mortgage servicing rights financing - fair value |  | 9.5
MSR related liabilities - nonrecourse |  | 1,006.0
Predecessor | Mortgage Servicing Rights |  |
Mortgage Servicing Rights [Line Items] |  |
Forward MSRs - fair value |  | 2,937.0
Reverse MSRs - amortized cost |  | 4.0
Mortgage servicing rights |  | 2,941.0
Mortgage servicing liabilities - amortized cost |  | 41.0
Predecessor | Mortgage Servicing Right Liability |  |
Mortgage Servicing Rights [Line Items] |  |
Excess spread financing - fair value |  | 996.0
Mortgage servicing rights financing - fair value |  | 10.0
MSR related liabilities - nonrecourse |  | $ 1,006.0

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- Definition Mortgage Servicing Rights Liability Resulting from Sale or Securitization of Servicer Advances, Rights not Accounted for as a Sale + References No definition available. + Details
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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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- Definition Amortized amount of contract to service financial assets under which estimated future revenues from contractually specified servicing fees, late charges, and other ancillary revenue are not expected to adequately compensate the servicer for performing the servicing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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