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Investment Securities (Non-agency Commercial Mortgage-backed Securities) (Details) (Fair Value, USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Investment securities |  |  |  |  |  |  |  |
Fair value investments | $ 6,565.5 | [1],[2] | $ 6,950.7 | [1],[2] | $ 6,571.9 | [3],[4] | $ 7,500.8 | [3],[4]
Fixed rate CMBS |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 199.6 |  |  |  |  |  |  |
Fixed rate CMBS | Super Senior |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 123.5 | [5] |  |  |  |  |  |
Fixed rate CMBS | Senior |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 58.7 | [6] |  |  |  |  |  |
Fixed rate CMBS | Subordinate |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 17.4 | [7] |  |  |  |  |  |
Floating rate CMBS |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 100.7 |  |  |  |  |  |  |
Floating rate CMBS | Super Senior |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 11.6 | [5] |  |  |  |  |  |
Floating rate CMBS | Senior |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 36.3 | [6] |  |  |  |  |  |
Floating rate CMBS | Subordinate |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 52.8 | [7] |  |  |  |  |  |
Commercial Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 300.3 |  | 334.1 |  |  |  |  |
Commercial Mortgage Backed Securities | Super Senior |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 135.1 | [5] |  |  |  |  |  |
Commercial Mortgage Backed Securities | Senior |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 95.0 | [6] |  |  |  |  |  |
Commercial Mortgage Backed Securities | Subordinate |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | $ 70.2 | [7] |  |  |  |  |  |
[1] | Carrying value includes $260.8 that is classified as assets held for sale relating to discontinued operations.
[2] | Excludes carrying value of $34.2 associated with other long-term investment limited partnerships accounted for using the equity method and $(0.1) related to forward contracts.
[3] | Carrying value includes $111.8 that is classified as assets held for sale relating to discontinued operations.
[4] | Excludes carrying value of $33.0 and $34.0 at January 1, 2012 and June 30, 2012 associated with other long-term investment limited partnerships accounted for using the equity method.
[5] | At issuance, Super Senior were rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were senior to other AAA or Aaa bonds.
[6] | At issuance, Senior were rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were senior to non-AAA or non-Aaa bonds.
[7] | At issuance, Subordinate were not rated AAA by Standard & Poor’s, Aaa by Moody’s or AAA by Fitch and were junior to AAA or Aaa bonds.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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