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Segment Information - Segment Pre-Tax Operating Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before income taxes	$ 1,889.6	$ 738.8	$ 5,987.0
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before income taxes	2,005.0	2,009.9	1,962.7
Operating Segments | Retirement and Income Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before income taxes	1,056.2	1,051.4	959.1
Operating Segments | Principal Asset Management
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before income taxes	861.2	817.7	902.7
Operating Segments | Benefits and Protection
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before income taxes	463.2	537.6	570.3
Operating Segments | Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) before income taxes	(375.6)	(396.8)	(469.4)
Reconciling items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Pre-tax net realized capital gains (losses), as adjusted	(142.3)	(88.6)	(251.4)
Pre-tax income (loss) from exited business	83.4	(1,129.8)	4,260.1
Adjustments related to equity method investments and noncontrolling interest	$ (56.5)	$ (52.7)	$ 15.6

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