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Summary of Significant Accounting Policies Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Other-than-temporary impairment on available-for-sale securities | $ 0 | $ 1,600,000 | $ 1,300,000
Fully depreciated assets taken out of service | 4,800,000 | 1,400,000 |
Property and equipment asset impairments | $ 0 | 0 | 0
Number of reporting units | 1 |  |
Number of operating segments | 1 |  |
Goodwill impairments | $ 0 | 0 | 0
Indefinite-lived intangible asset impairments | 0 | 0 | 0
Finite-lived intangible asset impairments | $ 0 | 0 | 0
Deferred sales commission asset estimated period of benefit | 8 years |  |
Amortization of deferred sales commissions | $ 8,025,000 | 11,980,000 | 15,054,000
Deferred sales commission asset impairments | 0 | 0 | 0
Total waived fees | 310,800,000 | 413,700,000 | 662,700,000
Change in Voluntary Yield-related Fee Waivers | (83,400,000) |  |
Advertising Expense | $ 1,500,000 | $ 2,700,000 | $ 2,600,000
Minimum [Member] |  |  |
Property and equipment, useful Life | 1 year |  |
Maximum [Member] |  |  |
Property and equipment, useful Life | 15 years |  |
Software and Software Development Costs [Member] |  |  |
Property and equipment, useful Life | 4 years |  |

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- Definition The maximum estimated period of benefit for commissions paid upon the sale of Class B shares of mutual funds without an upfront sales charge. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition The amount of expense recognized in the current period for the periodic realization of capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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