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Investment Securities (Debt Securities Issued By Corporation) (Details) (Debt securities issued by corporations, USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Investment securities |  |  |  |
Fair value investments | $ 2,347,200,000 | [1] | $ 2,385,100,000 | [1]
Other Standard Poors Rating [Member] |  |  |  |
Investment securities |  |  |  |
Fair value investments | 3,400,000 |  | 6,800,000 |
Standard & Poor's, BB Rating [Member] |  |  |  |
Investment securities |  |  |  |
Fair value investments | 0 |  | 7,000,000 |
BBB |  |  |  |
Investment securities |  |  |  |
Fair value investments | 1,075,500,000 |  | 1,116,900,000 |
A |  |  |  |
Investment securities |  |  |  |
Fair value investments | 1,039,500,000 |  | 1,061,000,000 |
AA |  |  |  |
Investment securities |  |  |  |
Fair value investments | 228,800,000 |  | 193,400,000 |
AAA |  |  |  |
Investment securities |  |  |  |
Fair value investments | $ 0 |  | $ 0 |
[1] | Credit ratings are assigned based on the following hierarchy: 1) Standard & Poor’s and 2) Moody’s

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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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- Details
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