Segment Information - Reconciliation of Segment Assets to Consolidated (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Segment Information: Assets
Total assets	$ 305,046.7	$ 290,867.0
Retirement and Income Solutions
Segment Information: Assets
Total assets	213,208.3	202,582.9
Principal Asset Management
Segment Information: Assets
Total assets	45,905.2	45,950.7
Benefits and Protection
Segment Information: Assets
Total assets	43,763.5	40,048.3
Corporate
Segment Information: Assets
Total assets	$ 2,169.7	$ 2,285.1