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Segment Information - Reconciliation of Segment Assets to Consolidated (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Segment Information: Assets
Total assets	$ 295,634.6	$ 296,627.7
Retirement and Income Solutions
Segment Information: Assets
Total assets	206,958.5	207,288.4
Principal Global Investors
Segment Information: Assets
Total assets	2,187.9	2,294.3
Principal International
Segment Information: Assets
Total assets	51,109.4	51,707.6
U.S. Insurance Solutions
Segment Information: Assets
Total assets	31,205.9	31,438.9
Corporate
Segment Information: Assets
Total assets	$ 4,172.9	$ 3,898.5

X

- Definition

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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