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Intangible Assets - Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 18, 2019 | Jul. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-lived Intangible Assets |  |  |  |  |
Amortization expense for finite-lived intangible assets |  |  | $ 7.5 | $ 6.2 | $ 0.6
Expected aggregate annual amortization expense for finite-lived intangible assets in 2020 |  |  | 8.6 |  |
Expected aggregate annual amortization expense for finite-lived intangible assets in 2021 |  |  | 8.6 |  |
Expected aggregate annual amortization expense for finite-lived intangible assets in 2022 |  |  | 8.6 |  |
Expected aggregate annual amortization expense for finite-lived intangible assets in 2023 |  |  | 8.6 |  |
Expected aggregate annual amortization expense for finite-lived intangible assets in 2024 |  |  | 8.6 |  |
Rights to Manage Fund Assets |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived intangible assets |  |  | 335.2 | 204.1 |
Rights to Manage Fund Assets | Hermes |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Increase of indefinite-lived intangible assets |  | $ 198.5 | 65.8 |  |
Trade Name |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived intangible assets |  |  | $ 52.0 | $ 50.1 |
Trade Name | Hermes |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Increase of indefinite-lived intangible assets |  | $ 49.9 |  |  |
PNC Capital Advisors LLC | Rights to Manage Fund Assets |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Increase of indefinite-lived intangible assets | $ 58.0 |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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