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Closed Block - Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Closed Block liabilities and assets designated to the Closed Block
Closed Block liabilities: Policyholder dividends obligation	$ 210.7	$ 298.2
Closed Block liabilities
Closed Block liabilities: Future policy benefits and claims	3,286.0	3,423.2
Closed Block liabilities: Other policyholder funds	5.3	6.0
Closed Block liabilities: Policyholder dividends payable	176.6	189.0
Closed Block liabilities: Policyholder dividends obligation	210.7	298.2
Closed Block liabilities: Other liabilities	8.8	8.7
Total Closed Block liabilities	3,687.4	3,925.1
Assets designated to the Closed Block
Closed Block assets: Fixed maturities, available-for-sale	2,191.6	2,353.3
Closed Block assets: Fixed maturities, trading	2.4	2.6
Closed Block assets: Equity securities	1.0	1.1
Closed Block assets: Mortgage loans	554.9	565.9
Closed Block assets: Policy loans	425.2	456.8
Closed Block assets: Other investments	48.4	61.7
Closed Block assets: Total investments	3,223.5	3,441.4
Closed Block assets: Cash and cash equivalents	19.7	23.2
Closed Block assets: Accrued investment income	32.6	35.4
Closed Block assets: Premiums due and other receivables	8.4	8.3
Closed Block assets: Deferred tax asset	24.6	24.2
Total assets designated to the Closed Block	3,308.8	3,532.5
Excess of Closed Block liabilities over assets designated to the Closed Block	378.6	392.6
Amounts included in accumulated other comprehensive income (loss)	0.6	0.9
Maximum future earnings to be recognized from Closed Block assets and liabilities	$ 379.2	$ 393.5	$ 426.9	$ 476.8

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