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Investment Securities (Fair Value of Hedge Funds Subject to Restrictions on Redemption Frequency) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Hedge funds |  |  |  |
Investment securities |  |  |  |
Other long-term investments | $ 126.2 |  |  |
Private equity funds |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 124.9 |  |  |
Hedge and private equity funds included in other long-term investments |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 251.1 | 239.0 |  |
Unfunded Commitments | 106.1 | 110.6 |  |
Level 3 Inputs | Fair value measured on a recurring basis | Other long-term investments |  |  |  |
Investment securities |  |  |  |
Carrying value of investment accounted for using the equity method | 25.0 | 26.6 | 34.9 | 35.0
Private equity funds | Private Equity Multi Sector |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 24.1 | 23.8 |  |
Unfunded Commitments | 6.4 | 6.5 |  |
Private equity funds | Private Equity Energy Infrastructure and Services |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 46.8 | 45.9 |  |
Unfunded Commitments | 12.7 | 13.1 |  |
Private equity funds | Real Estate Funds |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 7.1 | 8.2 |  |
Unfunded Commitments | 3.3 | 3.3 |  |
Private equity funds | Private Equity Secondaries |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 9.2 | 9.5 |  |
Unfunded Commitments | 3.1 | 3.1 |  |
Private equity funds | Private Equity Funds Multi Sector Europe |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 3.8 | 3.9 |  |
Unfunded Commitments | 2.8 | 2.8 |  |
Private equity funds | Private Equity Funds Manufacturing and Industrial |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 11.5 | 11.2 |  |
Unfunded Commitments | 15.2 | 15.5 |  |
Private equity funds | Private Equity Healthcare |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 7.8 | 5.6 |  |
Unfunded Commitments | 2.8 | 2.8 |  |
Private equity funds | Private Equity Funds Multi Sector Asia |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 0 | 0 |  |
Unfunded Commitments | 2.7 | 2.7 |  |
Private equity funds | Private Equity Insurance |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 2.4 | 2.3 |  |
Unfunded Commitments | 41.3 | 41.3 |  |
Private equity funds | Aerospace Defense Government |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 10.6 | 5.8 |  |
Unfunded Commitments | 15.5 | 19.2 |  |
Private equity funds | Venture Capital Funds |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 1.6 | 1.6 |  |
Unfunded Commitments | 0.3 | 0.3 |  |
Private equity funds | Private equity funds |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 124.9 | 118.2 |  |
Unfunded Commitments | 106.1 | 110.6 |  |
Hedge funds | Hedge Funds, Equity Long (Short) [Member] |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 67.6 | 62.6 |  |
Unfunded Commitments | 0 | 0 |  |
Hedge funds | Hedge Funds Credit and Distressed |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 23.3 | 22.8 |  |
Unfunded Commitments | 0 | 0 |  |
Hedge funds | Hedge Funds Diversified Strategies |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 0 | 0.1 |  |
Unfunded Commitments | 0 | 0 |  |
Hedge funds | Hedge Funds Equity R E I T |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 18.8 | 18.3 |  |
Unfunded Commitments | 0 | 0 |  |
Hedge funds | Hedge Funds Equity Activist |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 16.3 | 16.8 |  |
Unfunded Commitments | 0 | 0 |  |
Hedge funds | Hedge Funds Bank Loan |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 0.2 | 0.2 |  |
Unfunded Commitments | 0 | 0 |  |
Hedge funds | Hedge funds |  |  |  |
Investment securities |  |  |  |
Other long-term investments | 126.2 | 120.8 |  |
Unfunded Commitments | $ 0 | $ 0 |  |

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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL6742756-110258 + Details
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- Definition Amount of other investments classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1(c),(d),(e),(f),(g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph c, d, e, f, g -Article 7 + Details
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