Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Carrying amounts of consolidated VIE assets and liabilities
Total assets	$ 292,239.6	$ 304,657.2
Total liabilities	281,934.8	288,198.9
Redeemable noncontrolling interest	262.0	332.5	$ 255.6	$ 264.9
Aggregate consolidated variable interest entities
Carrying amounts of consolidated VIE assets and liabilities
Total assets	37,220.5	37,269.2
Total liabilities	34,614.9	34,360.7
Redeemable noncontrolling interest	235.3	304.0
Mandatory retirement savings funds
Carrying amounts of consolidated VIE assets and liabilities
Total assets	34,876.9	34,687.0
Total liabilities	34,528.3	34,301.8
Real estate VIE
Carrying amounts of consolidated VIE assets and liabilities
Total assets	689.6	709.6
Total liabilities	42.2	36.1
Sponsored investment funds
Carrying amounts of consolidated VIE assets and liabilities
Total assets	471.4	609.4
Total liabilities	2.6	2.5
Redeemable noncontrolling interest	235.3	304.0
Residential mortgage loans VIE
Carrying amounts of consolidated VIE assets and liabilities
Total assets	1,182.6	1,263.2
Total liabilities	$ 41.8	$ 20.3