XML 32 R10.htm IDEA: XBRL DOCUMENT
v3.20.4

Investments in Marketable Securities | 12 Months Ended
--- | ---
Dec. 31, 2020
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable SecuritiesThe following is a summary of the cost, gross unrealized gains, unrealized losses, and fair value of Investments in marketable securities:
|  | December 31,
|  | 2019 |  | 2020
Cost |  | $ | 57.9 |  |  | $ | 69.4 |
Unrealized gains |  | 2.1 |  |  | 5.5 |
Unrealized losses |  | (0.6) |  |  | (0.0) |
Fair value |  | $ | 59.4 |  |  | $ | 74.9 |
As of December 31, 2019 and 2020, Investments in marketable securities include consolidated Affiliate sponsored investment products with fair values of $38.1 million and $52.3 million, respectively.

X
- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
Name: | us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration