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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2014 | Sep. 30, 2015 | Dec. 31, 2013 | Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Estimated litigation liability |  | $ 11.1 | $ 21.2 | $ 17.5
Change in estimated litigation liability | $ (2.3) |  |  |
Legal fees paid | $ 7.8 |  |  |
Unfunded commitments to limited partnerships |  | 28.5 |  |
Unfunded commitments to secured bank loans |  | $ 13.9 |  |

X
- Definition Amount that we have committed to investment partnerships, less what we have contributed as capital to date. + References No definition available. + Details
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- Definition Amount of secured bank loans that we have agreed to purchase as of the end of the reporting period. + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of payments made reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of increase (decrease) in loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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