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Insurance Liabilities - Discounting Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]
Carrying amount of liabilities for unpaid claims	$ 1,210.8
Aggregate amount of discount	208.0
Long-Term Disability/Group Life Waiver
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]
Carrying amount of liabilities for unpaid claims	1,057.5	$ 1,047.6
Aggregate amount of discount	208.0	214.5
Interest accretion	$ 33.8	$ 33.9	$ 34.2
Long-Term Disability/Group Life Waiver | Minimum
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]
Discount rate	2.80%	2.80%
Long-Term Disability/Group Life Waiver | Maximum
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]
Discount rate	7.00%	7.00%
Dental/Vision/Short-Term Disability/Critical Illness/Accident
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]
Carrying amount of liabilities for unpaid claims	$ 73.1	$ 70.4
Group Life
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]
Carrying amount of liabilities for unpaid claims	$ 80.2	$ 54.1

X

- Definition

The carrying amount as of the balance sheet date of loss reserves carried at present value.

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- Definition

Discount rate used to obtain present value of liability for unpaid claim and claim adjustment expense for short-duration contract issued by insurance entity.

+ References

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Amount of cumulative discount related to the time value of money deducted from short-duration insurance contract liabilities that are reported at present value.

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Amount of interest accretion recognized for short-duration insurance contract liabilities that are reported at present value.

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