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Separate Account Balances - Principal Asset Management - International Pension (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Changes in separate account liabilities
Balance at beginning of period	$ 173,327.1
Balance at end of period	171,266.2	$ 173,327.1
Principal Asset Management | International Pension | Pension | Latin America
Changes in separate account liabilities
Balance at beginning of period	32,802.2	34,580.6
Premiums and deposits	764.3	3,347.7
Policy charges	(4.3)	(16.6)
Surrenders, withdrawals and benefit payments	(930.1)	(3,638.0)
Investment performance	564.5	2,890.1
Other	(24.6)	22.8
Foreign currency translation adjustment	1,486.5	(4,384.4)
Balance at end of period	34,658.5	32,802.2
Cash surrender value	$ 34,658.5	$ 32,802.2

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