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Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 01, 2020 | Jan. 01, 2020
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived intangible assets, foreign currency translation | $ 7.9 |  |  |  |
Finite-lived intangible assets, foreign currency translation | 3.1 |  |  |  |
Amortization expense for finite-lived intangible assets | 13.8 | $ 7.5 | $ 6.2 |  |
Goodwill, period increase (decrease) | 25.7 |  |  |  |
Goodwill, foreign currency translation | 4.9 |  |  |  |
H G P E Capital Limited |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets |  |  |  | $ 27.6 |
Goodwill, acquired during period | 19.1 |  |  |  |
M E P C Limited |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | $ 7.3
Goodwill, acquired during period | 1.7 |  |  |  |
Rights to Manage Fund Assets |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived intangible assets | 343.5 | 335.2 |  |  |
Trade Name |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived intangible assets | $ 53.6 | $ 52.0 |  |  |

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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=121586364&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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