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Intangible Assets	12 Months Ended
Intangible Assets	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.