Fair Value Disclosures - Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Financial Assets
Fixed maturity securities, fair value	$ 9,054.9	$ 8,577.7
Equity securities at fair value	188.9	207.1
States, municipalities and political subdivisions
Financial Assets
Fixed maturity securities, fair value	65.5	96.1
Foreign governments
Financial Assets
Fixed maturity securities, fair value	636.8	593.9
Asset-backed
Financial Assets
Fixed maturity securities, fair value	814.8	845.7
Commercial mortgage-backed
Financial Assets
Fixed maturity securities, fair value	482.8	417.4
Residential mortgage-backed
Financial Assets
Fixed maturity securities, fair value	1,186.6	954.7
U.S. corporate
Financial Assets
Fixed maturity securities, fair value	3,912.4	3,877.6
Foreign corporate
Financial Assets
Fixed maturity securities, fair value	1,874.1	1,729.4
Recurring
Financial Assets
Short-term investments	251.6	336.3
Other investments	64.4	72.2
Cash equivalents	1,318.9	1,349.3
Other assets	1.0	6.4
Total financial assets	10,879.7	10,549.0
Financial Liabilities
Other liabilities	102.9	85.0
Total financial liabilities	102.9	85.0
Recurring \| Level 1
Financial Assets
Short-term investments	227.8	329.0
Other investments	64.4	72.2
Cash equivalents	1,276.3	1,335.5
Other assets	0.0	0.0
Total financial assets	1,588.6	1,754.8
Financial Liabilities
Other liabilities	61.1	62.7
Total financial liabilities	61.1	62.7
Recurring \| Level 2
Financial Assets
Short-term investments	23.8	7.3
Other investments	0.0	0.0
Cash equivalents	42.6	13.8
Other assets	0.0	0.0
Total financial assets	8,940.7	8,563.0
Financial Liabilities
Other liabilities	0.0	0.0
Total financial liabilities	0.0	0.0
Recurring \| Level 3
Financial Assets
Short-term investments	0.0	0.0
Other investments	0.0	0.0
Cash equivalents	0.0	0.0
Other assets	1.0	6.4
Total financial assets	350.4	231.2
Financial Liabilities
Other liabilities	41.8	22.3
Total financial liabilities	41.8	22.3
Recurring \| U.S. government and government agencies and authorities
Financial Assets
Fixed maturity securities, fair value	81.9	62.9
Recurring \| U.S. government and government agencies and authorities \| Level 1
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| U.S. government and government agencies and authorities \| Level 2
Financial Assets
Fixed maturity securities, fair value	81.9	62.9
Recurring \| U.S. government and government agencies and authorities \| Level 3
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| States, municipalities and political subdivisions
Financial Assets
Fixed maturity securities, fair value	65.5	96.1
Recurring \| States, municipalities and political subdivisions \| Level 1
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| States, municipalities and political subdivisions \| Level 2
Financial Assets
Fixed maturity securities, fair value	65.5	96.1
Recurring \| States, municipalities and political subdivisions \| Level 3
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| Foreign governments
Financial Assets
Fixed maturity securities, fair value	636.8	593.9
Recurring \| Foreign governments \| Level 1
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| Foreign governments \| Level 2
Financial Assets
Fixed maturity securities, fair value	636.8	593.9
Recurring \| Foreign governments \| Level 3
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| Asset-backed
Financial Assets
Fixed maturity securities, fair value	814.8	845.7
Recurring \| Asset-backed \| Level 1
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| Asset-backed \| Level 2
Financial Assets
Fixed maturity securities, fair value	649.9	715.9
Recurring \| Asset-backed \| Level 3
Financial Assets
Fixed maturity securities, fair value	164.9	129.8
Recurring \| Commercial mortgage-backed
Financial Assets
Fixed maturity securities, fair value	482.8	417.4
Recurring \| Commercial mortgage-backed \| Level 1
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| Commercial mortgage-backed \| Level 2
Financial Assets
Fixed maturity securities, fair value	480.6	417.4
Recurring \| Commercial mortgage-backed \| Level 3
Financial Assets
Fixed maturity securities, fair value	2.2	0.0
Recurring \| Residential mortgage-backed
Financial Assets
Fixed maturity securities, fair value	1,186.6	954.7
Recurring \| Residential mortgage-backed \| Level 1
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| Residential mortgage-backed \| Level 2
Financial Assets
Fixed maturity securities, fair value	1,177.6	954.7
Recurring \| Residential mortgage-backed \| Level 3
Financial Assets
Fixed maturity securities, fair value	9.0	0.0
Recurring \| U.S. corporate
Financial Assets
Fixed maturity securities, fair value	3,912.4	3,877.6
Recurring \| U.S. corporate \| Level 1
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| U.S. corporate \| Level 2
Financial Assets
Fixed maturity securities, fair value	3,792.5	3,812.0
Recurring \| U.S. corporate \| Level 3
Financial Assets
Fixed maturity securities, fair value	119.9	65.6
Recurring \| Foreign corporate
Financial Assets
Fixed maturity securities, fair value	1,874.1	1,729.4
Recurring \| Foreign corporate \| Level 1
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| Foreign corporate \| Level 2
Financial Assets
Fixed maturity securities, fair value	1,842.1	1,721.5
Recurring \| Foreign corporate \| Level 3
Financial Assets
Fixed maturity securities, fair value	32.0	7.9
Recurring \| Mutual funds
Financial Assets
Equity securities at fair value	38.9	37.3
Recurring \| Mutual funds \| Level 1
Financial Assets
Equity securities at fair value	17.9	16.1
Recurring \| Mutual funds \| Level 2
Financial Assets
Equity securities at fair value	0.0	0.0
Recurring \| Mutual funds \| Level 3
Financial Assets
Equity securities at fair value	21.0	21.2
Recurring \| Common stocks
Financial Assets
Equity securities at fair value	2.2	2.0
Recurring \| Common stocks \| Level 1
Financial Assets
Equity securities at fair value	2.2	2.0
Recurring \| Common stocks \| Level 2
Financial Assets
Equity securities at fair value	0.0	0.0
Recurring \| Common stocks \| Level 3
Financial Assets
Equity securities at fair value	0.0	0.0
Recurring \| Non-redeemable preferred stocks
Financial Assets
Equity securities at fair value	147.8	167.8
Recurring \| Non-redeemable preferred stocks \| Level 1
Financial Assets
Equity securities at fair value	0.0	0.0
Recurring \| Non-redeemable preferred stocks \| Level 2
Financial Assets
Equity securities at fair value	147.4	167.5
Recurring \| Non-redeemable preferred stocks \| Level 3
Financial Assets
Equity securities at fair value	$ 0.4	$ 0.3

Other Investments, Fair Value Disclosure

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Short Term Investments, Fair Value Disclosure

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Fair value portion of asset recognized for present right to economic benefit.

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

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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Fair value portion of other assets.

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-Paragraph 11
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
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