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Nature of Operations and Significant Accounting Policies - Recent Accounting Pronouncements and Separate Accounts (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Recent Accounting Pronouncements |  |
Total stockholders' equity | $ 9,446.2 | $ 16,069.4
Separate Accounts |  |
Separate account that primarily includes shares of Principal Financial Group, Inc. stock that were allocated and issued to eligible participants of qualified employee benefit plans as part of the 2001 demutualization | 89.7 | $ 95.1
Accounting Standards Update 2018-12 - Targeted improvements to the accounting for long-duration insurance contracts | Adjustment related to adoption of ASU | Minimum |  |
Recent Accounting Pronouncements |  |
Total stockholders' equity | (5,000.0) |
Accounting Standards Update 2018-12 - Targeted improvements to the accounting for long-duration insurance contracts | Adjustment related to adoption of ASU | Maximum |  |
Recent Accounting Pronouncements |  |
Total stockholders' equity | $ (5,600.0) |

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