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Debt Warehouse Facilities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Sep. 30, 2017
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 350.0 |  | $ 350.0 |
Line of Credit Facility, Maximum Borrowing Capacity | 850.0 | $ 1,025.0 | 850.0 |
Warehouse Agreement Borrowings [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Unamortized Debt Issuance Expense | $ 1.2 | $ 0.9 | $ 1.2 |
Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate During Period | 2.00% | 1.50% |  |
Line of Credit Facility, Average Outstanding Amount | $ 888.5 | $ 981.6 |  |
Pricing on the Facility based on market rates |  |  | LIBOR plus 0.95% to 2.05% |
Line of Credit Facility, Maximum Borrowing Capacity | 2,750.0 |  | $ 2,750.0 |
Unamortized Debt Issuance Expense | 15.3 | 19.6 | $ 15.3 |
Agreement expires September 25, 2017 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 275.0
Agreement expires September 24, 2018, Extension [Member] [Member] [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Pricing on the Facility based on market rates |  |  | LIBOR plus 1.4% |
Line of Credit, Outstanding Balance | 156.4 | 135.2 | $ 156.4 |
Line of Credit Facility, Maximum Borrowing Capacity | 375.0 | 275.0 | $ 375.0 |
Agreement expires September 29, 2018, Extension [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Pricing on the Facility based on market rates |  |  | LIBOR plus 1.35% |
Line of Credit, Outstanding Balance | 74.8 | 314.7 | $ 74.8 |
Line of Credit Facility, Maximum Borrowing Capacity | 375.0 | 650.0 | $ 375.0 |
Agreement expires August 31, 2018 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Pricing on the Facility based on market rates |  |  | LIBOR plus 1.5% |
Line of Credit, Outstanding Balance | 0.0 | 15.0 | $ 0.0 |
Line of Credit Facility, Maximum Borrowing Capacity | 100.0 | 100.0 | 100.0 |
Fannie Mae ASAP program [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Fannie Mae ASAP Program, Outstanding Balance | 79.2 | 116.1 | $ 79.2 |
Debt Instrument, Interest Rate Terms |  |  | LIBOR plus 1.30% to 1.45% |
Line of Credit, Gross [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit, Outstanding Balance | $ 310.4 | $ 581.0 | $ 310.4 |
Agreement expires September 22, 2017 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 250.0

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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