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Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets Disclosure | Intangible Assets (a) Indefinite-lived intangible assets Indefinite-lived intangible assets include renewable investment advisory contracts included in Renewable investment advisory contracts on the Consolidated Balance Sheets ($73.9 million and $70.4 million at December 31, 2017 and December 31, 2016, respectively) and trade names included in Other intangible assets, net on the Consolidated Balance Sheets ($1.9 million at both December 31, 2017 and December 31, 2016). (b) Finite-lived intangible assets Finite-lived intangible assets representing customer relationships totaled $1.1 million and $1.7 million at December 31, 2017 and December 31, 2016, respectively, and were included in Other intangible assets, net on the Consolidated Balance Sheets.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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