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Investment Securities (Mortgage-backed Asset Securities) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
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Level 2 Inputs |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | $ 4,721.2 |  | $ 5,206.1 |  | $ 5,006.4 |  | $ 6,088.2 |
Level 2 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 818.0 |  | 1,013.4 |  |  |  |  |
Level 2 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 52.5 |  | 74.6 |  |  |  |  |
Level 2 Inputs | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 47.8 |  | 55.8 |  |  |  |  |
Level 2 Inputs | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 918.3 | [1] | 1,143.8 | [1] |  |  |  |
Level 2 Inputs | Residential Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 109.6 |  | 160.6 |  |  |  |  |
Level 2 Inputs | Commercial Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 300.3 |  | 334.1 |  |  |  |  |
Level 2 Inputs | Mortgage-backed Securities, Issued by Private Enterprises |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 409.9 |  | 494.7 |  |  |  |  |
Level 2 Inputs | Collateralized Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 1,328.2 |  | 1,638.5 |  |  |  |  |
Level 2 Inputs | Collateralized Credit Card Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 116.0 |  | 151.4 |  |  |  |  |
Level 2 Inputs | Collateralized Auto Loans |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 167.1 |  | 233.2 |  |  |  |  |
Level 2 Inputs | Collateralized Securities, Other |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 177.3 |  | 50.4 |  |  |  |  |
Level 2 Inputs | Asset-backed Securities, Securitized Loans and Receivables |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 460.4 |  | 435.0 |  |  |  |  |
Level 2 Inputs | Mortgage-backed and asset-backed securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 1,788.6 |  | 2,073.5 |  |  |  |  |
Level 3 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 0 |  | 0 |  |  |  |  |
Level 3 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 0 |  | 0 |  |  |  |  |
Level 3 Inputs | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 0 |  | 0 |  |  |  |  |
Level 3 Inputs | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 0 | [1] | 0 | [1] |  |  |  |
Level 3 Inputs | Residential Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 24.0 |  | 0 |  |  |  |  |
Level 3 Inputs | Commercial Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 0 |  | 0 |  |  |  |  |
Level 3 Inputs | Mortgage-backed Securities, Issued by Private Enterprises |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 24.0 |  | 0 |  |  |  |  |
Level 3 Inputs | Collateralized Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 24.0 |  | 0 |  |  |  |  |
Level 3 Inputs | Collateralized Credit Card Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 22.0 |  | 22.1 |  |  |  |  |
Level 3 Inputs | Collateralized Auto Loans |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 0 |  | 0 |  |  |  |  |
Level 3 Inputs | Collateralized Securities, Other |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 0 |  | 0 |  |  |  |  |
Level 3 Inputs | Asset-backed Securities, Securitized Loans and Receivables |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 22.0 |  | 22.1 |  |  |  |  |
Level 3 Inputs | Mortgage-backed and asset-backed securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 46.0 |  | 22.1 |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 6,565.5 | [2],[3] | 6,950.7 | [2],[3] | 6,571.9 | [4],[5] | 7,500.8 | [4],[5]
Fair Value | Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 818.0 |  | 1,013.4 |  |  |  |  |
Fair Value | Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 52.5 |  | 74.6 |  |  |  |  |
Fair Value | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 47.8 |  | 55.8 |  |  |  |  |
Fair Value | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 918.3 | [1] | 1,143.8 | [1] |  |  |  |
Fair Value | Residential Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 133.6 |  | 160.6 |  |  |  |  |
Fair Value | Commercial Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 300.3 |  | 334.1 |  |  |  |  |
Fair Value | Mortgage-backed Securities, Issued by Private Enterprises |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 433.9 |  | 494.7 |  |  |  |  |
Fair Value | Collateralized Mortgage Backed Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 1,352.2 |  | 1,638.5 |  |  |  |  |
Fair Value | Collateralized Credit Card Securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 138.0 |  | 173.5 |  |  |  |  |
Fair Value | Collateralized Auto Loans |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 167.1 |  | 233.2 |  |  |  |  |
Fair Value | Collateralized Securities, Other |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 177.3 |  | 50.4 |  |  |  |  |
Fair Value | Asset-backed Securities, Securitized Loans and Receivables |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | 482.4 |  | 457.1 |  |  |  |  |
Fair Value | Mortgage-backed and asset-backed securities |  |  |  |  |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Fair value investments | $ 1,834.6 |  | $ 2,095.6 |  |  |  |  |
[1] | Represents publicly traded mortgage-backed securities which carry the full faith and credit guaranty of the U.S. government (i.e., GNMA) or are guaranteed by a government sponsored entity (i.e., FNMA, FHLMC).
[2] | Carrying value includes $260.8 that is classified as assets held for sale relating to discontinued operations.
[3] | 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.
[4] | Carrying value includes $111.8 that is classified as assets held for sale relating to discontinued operations.
[5] | 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.

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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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