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Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Carrying amounts of consolidated VIE assets and liabilities
Total assets	$ 302,165.5		$ 296,627.7
Total liabilities	285,543.4		279,754.8
Redeemable noncontrolling interest	330.6	$ 263.5	255.6	$ 272.7	$ 239.7	$ 264.9
Aggregate consolidated variable interest entities
Carrying amounts of consolidated VIE assets and liabilities
Total assets	40,776.7		43,233.5
Total liabilities	38,616.0		41,552.4
Redeemable noncontrolling interest	259.1		226.8
Mandatory retirement savings funds
Carrying amounts of consolidated VIE assets and liabilities
Total assets	39,005.1		41,995.2
Total liabilities	38,573.4		41,527.9
Real estate VIE
Carrying amounts of consolidated VIE assets and liabilities
Total assets	632.8		499.0
Total liabilities	35.9		21.3
Sponsored investment funds
Carrying amounts of consolidated VIE assets and liabilities
Total assets	484.1		419.5
Total liabilities	6.7		3.2
Redeemable noncontrolling interest	259.1		226.8
Residential mortgage loans
Carrying amounts of consolidated VIE assets and liabilities
Total assets	$ 654.7		$ 319.8

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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