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Investments in Affiliates and Affiliate Sponsored Investment Products - Affiliate Accounted For Under Equity Method (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Equity method investments in Affiliates (net)	$ 2,074.8	$ 2,195.6
Carrying amount and maximum exposure to loss of equity method affiliates	112.7	352.6
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Unconsolidated VIE Net Assets	1,384.2	1,141.4
Carrying Value and Maximum Exposure to Loss	1,962.1	1,843.0
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Unconsolidated VIE Net Assets	$ 2,378.2	$ 2,282.1

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