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Investment Securities (Mortgage-backed Asset Securities Table) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Level 2 Inputs |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | $ 4,774.0 | $ 4,982.2 | $ 4,721.2 | $ 5,206.1
Level 2 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 437.7 | 512.3 |  |
Level 2 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 57.6 | 81.2 |  |
Level 2 Inputs | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 39.5 | 91.3 |  |
Level 2 Inputs | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 534.8 | 684.8 |  |
Level 2 Inputs | Residential Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 146.4 | 125.7 |  |
Level 2 Inputs | Commercial Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 323.5 | 282.3 |  |
Level 2 Inputs | Mortgage-backed Securities, Issued by Private Enterprises |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 469.9 | 408.0 |  |
Level 2 Inputs | Collateralized Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 1,004.7 | 1,092.8 |  |
Level 2 Inputs | Collateralized Credit Card Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 374.7 | 289.4 |  |
Level 2 Inputs | Collateralized Auto Loans |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 159.2 | 365.0 |  |
Level 2 Inputs | Collateralized Securities, Other |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 200.6 | 245.3 |  |
Level 2 Inputs | Asset-backed Securities, Securitized Loans and Receivables |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 734.5 | 899.7 |  |
Level 2 Inputs | Mortgage-backed and asset-backed securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 1,739.2 | 1,992.5 |  |
Level 3 Inputs | Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 0 | 0 |  |
Level 3 Inputs | Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 0 | 0 |  |
Level 3 Inputs | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 0 | 0 |  |
Level 3 Inputs | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 0 | 0 |  |
Level 3 Inputs | Residential Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 45.2 | 0 |  |
Level 3 Inputs | Commercial Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 19.7 | 0 |  |
Level 3 Inputs | Mortgage-backed Securities, Issued by Private Enterprises |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 64.9 | 0 |  |
Level 3 Inputs | Collateralized Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 64.9 | 0 |  |
Level 3 Inputs | Collateralized Credit Card Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 22.0 | 22.0 |  |
Level 3 Inputs | Collateralized Auto Loans |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 0 | 0 |  |
Level 3 Inputs | Collateralized Securities, Other |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 0 | 0 |  |
Level 3 Inputs | Asset-backed Securities, Securitized Loans and Receivables |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 22.0 | 22.0 |  |
Level 3 Inputs | Mortgage-backed and asset-backed securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 86.9 | 22.0 |  |
Fair Value |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 6,777.0 | 6,766.5 | 6,565.5 | 6,950.7
Fair Value | Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 437.7 | 512.3 |  |
Fair Value | Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 57.6 | 81.2 |  |
Fair Value | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 39.5 | 91.3 |  |
Fair Value | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 534.8 | 684.8 |  |
Fair Value | Residential Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 191.6 | 125.7 |  |
Fair Value | Commercial Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 343.2 | 282.3 |  |
Fair Value | Mortgage-backed Securities, Issued by Private Enterprises |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 534.8 | 408.0 |  |
Fair Value | Collateralized Mortgage Backed Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 1,069.6 | 1,092.8 |  |
Fair Value | Collateralized Credit Card Securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 396.7 | 311.4 |  |
Fair Value | Collateralized Auto Loans |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 159.2 | 365.0 |  |
Fair Value | Collateralized Securities, Other |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 200.6 | 245.3 |  |
Fair Value | Asset-backed Securities, Securitized Loans and Receivables |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | 756.5 | 921.7 |  |
Fair Value | Mortgage-backed and asset-backed securities |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Fair value investments | $ 1,826.1 | $ 2,014.5 |  |

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- Definition Fair value portion of investment securities, including, but not limited to, 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 Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: 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 3: 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=28360136&loc=d3e22054-111558 Reference 4: 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 5: 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=27723805&loc=d3e24584-111560 + Details
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