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Goodwill and Other Intangible Assets - Changes in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Changes in Goodwill
Beginning balance, Goodwill	$ 1,711.0	$ 1,693.8
Goodwill disposed	(2.3)
Impairment	(1.0)
Foreign currency, Goodwill	(80.1)	17.2
Ending balance, Goodwill	1,627.6	1,711.0
Retirement and Income Solutions
Changes in Goodwill
Beginning balance, Goodwill	675.9	675.9
Ending balance, Goodwill	675.9	675.9
Principal Global Investors
Changes in Goodwill
Beginning balance, Goodwill	320.9	317.5
Foreign currency, Goodwill	(2.5)	3.4
Ending balance, Goodwill	318.4	320.9
Principal International
Changes in Goodwill
Beginning balance, Goodwill	656.6	642.8
Goodwill disposed	(2.3)
Foreign currency, Goodwill	(77.6)	13.8
Ending balance, Goodwill	576.7	656.6
U.S. Insurance Solutions
Changes in Goodwill
Beginning balance, Goodwill	56.6	56.6
Ending balance, Goodwill	56.6	56.6
Corporate
Changes in Goodwill
Beginning balance, Goodwill	1.0	1.0
Impairment	$ (1.0)
Ending balance, Goodwill		$ 1.0

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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