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Mortgage Loans - Mortgage Loans Held for Sale (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017
Loans Receivable [Line Items] |  |  |  |  |
Mortgage loans held for sale | $ 679.9 |  | $ 679.9 |  | $ 587.3
Aggregate outstanding principal amounts | 659.2 |  | 659.2 |  | 570.8
Mortgage loans originated |  |  | 5,500.0 | $ 4,800.0 |
Mortgage loans sold |  |  | 5,400.0 | 4,800.0 |
Net gain on sales of loans | 68.0 | $ 65.0 | $ 193.7 | $ 185.9 |
Percentage of mortgage loans sold to significant purchasers |  |  | 93.00% |  |
Percentage of mortgage loans sold to one significant purchaser |  |  | 38.00% |  |
Uncommitted Loans [Member] |  |  |  |  |
Loans Receivable [Line Items] |  |  |  |  |
Mortgage loans held for sale | 428.6 |  | $ 428.6 |  | 330.7
Uncommitted Loans [Member] | Hedging Instruments related to IRLCs [Member] |  |  |  |  |
Loans Receivable [Line Items] |  |  |  |  |
Notional amounts of hedging instruments, Total | $ 428.6 |  | $ 428.6 |  | $ 330.7

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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition The amount of cash paid for the origination of mortgages that are held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719 + Details
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