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Investment Securities (Fair Value of Hedge Funds Subject to Restrictions on Redemption Frequency) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Hedge funds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | $ 114.6 |
Private equity funds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 127.3 |
Hedge and private equity funds included in other long-term investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 241.9 | 239.0
Unfunded Commitments | 98.4 | 110.6
Private equity funds | Private Equity Multi Sector |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 24.5 | 23.8
Unfunded Commitments | 5.9 | 6.5
Private equity funds | Private Equity Energy Infrastructure and Services |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 46.8 | 45.9
Unfunded Commitments | 11.0 | 13.1
Private equity funds | Real Estate Funds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 3.5 | 8.2
Unfunded Commitments | 3.3 | 3.3
Private equity funds | Private Equity Secondaries |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 9.4 | 9.5
Unfunded Commitments | 3.1 | 3.1
Private equity funds | Private Equity Funds Multi Sector Europe |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 2.8 | 3.9
Unfunded Commitments | 2.5 | 2.8
Private equity funds | Private Equity Distressed Residential Real Estate [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 0 | 0.4
Unfunded Commitments | 0 | 0
Private equity funds | Private Equity Funds Manufacturing and Industrial |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 18.8 | 11.2
Unfunded Commitments | 14.8 | 15.5
Private equity funds | Private Equity Healthcare |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 5.8 | 5.6
Unfunded Commitments | 2.8 | 2.8
Private equity funds | Private Equity Funds Multi Sector Asia |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 0 | 0
Unfunded Commitments | 0 | 2.7
Private equity funds | Private Equity Insurance |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 2.2 | 2.3
Unfunded Commitments | 41.3 | 41.3
Private equity funds | Aerospace Defense Government |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 12.1 | 5.8
Unfunded Commitments | 13.4 | 19.2
Private equity funds | Venture Capital Funds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 1.4 | 1.6
Unfunded Commitments | 0.3 | 0.3
Private equity funds | Private equity funds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 127.3 | 118.2
Unfunded Commitments | 98.4 | 110.6
Hedge funds | Hedge Funds, Equity Long (Short) [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 54.8 | 62.6
Unfunded Commitments | 0 | 0
Hedge funds | Hedge Funds Credit and Distressed |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 22.9 | 22.8
Unfunded Commitments | 0 | 0
Hedge funds | Hedge Funds Diversified Strategies |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 0 | 0.1
Unfunded Commitments | 0 | 0
Hedge funds | Hedge Funds Equity R E I T |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 19.5 | 18.3
Unfunded Commitments | 0 | 0
Hedge funds | Hedge Funds Equity Activist |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 17.2 | 16.8
Unfunded Commitments | 0 | 0
Hedge funds | Hedge Funds Bank Loan |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 0.2 | 0.2
Unfunded Commitments | 0 | 0
Hedge funds | Hedge funds |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other long-term investments | 114.6 | 120.8
Unfunded Commitments | $ 0 | $ 0

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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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