Segment Information (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Operating segments \| Segment	4
Identifiable assets	$ 86.6	$ 84.1
Liabilities held-for-sale	113.0	110.2
Accident and Health Insurance Business [Member]
Segment Reporting Information [Line Items]
Identifiable assets	84.4	82.2
Liabilities held-for-sale	83.5	80.9
Income (loss) from discontinued businesses, net of taxes	0.6	(0.8)	$ 1.6
Income tax expense (benefit) related to discontinued operations	$ 0.2	$ (0.2)	$ 0.4

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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