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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,790.1
Ending balance	1,692.9	$ 1,477.6
Net unrealized investment gains (losses) on securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	366.3	230.4
Ending balance	243.6	136.6
Net unrealized investment gains (losses) on securities \| Fixed maturity securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	439.8	264.4
Change in net unrealized investment gains (losses) on fixed maturity securities	(159.0)	(103.8)
Reclassification of net investment (gains) losses on securities to net income	6.4	(10.7)
Ending balance	$ 287.2	$ 149.9

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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