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Income from Investments - Net Realized Gains on Sales of Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity Securities:
Realized Investment Gains	$ 68.0	$ 48.3	$ 46.9
Realized Investment Losses	(3.2)	(10.2)	(5.0)
Net Realized Gains on Sales of Investments	64.8	38.1	41.9
Fixed Maturities:
Fixed Maturities:
Gains on Sales	63.4	40.6	41.1
Losses on Sales	(2.1)	(7.9)	(4.8)
Equity Securities
Equity Securities:
Gains on Sales	4.1	5.9	5.8
Losses on Sales	(0.7)	(1.9)	(0.2)
Real Estate
Equity Securities:
Realized Investment Gains	0.1	$ 1.8	$ 0.0
Realized Investment Losses	$ (0.4)

X

- Definition

The net realized gains on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity

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The net realized losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity

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- Definition

Amount of realized gain (loss) on investment in debt and equity securities.

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- Definition

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714

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Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
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