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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

X

- 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.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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