Fair Value Disclosures - Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Financial Assets
Fixed maturity securities, fair value	$ 8,783.8	$ 8,577.7
Equity securities at fair value	197.3	207.1
Other investments	601.5	573.0
States, municipalities and political subdivisions
Financial Assets
Fixed maturity securities, fair value	94.8	96.1
Foreign governments
Financial Assets
Fixed maturity securities, fair value	615.0	593.9
Asset-backed
Financial Assets
Fixed maturity securities, fair value	850.1	845.7
Commercial mortgage-backed
Financial Assets
Fixed maturity securities, fair value	419.0	417.4
Residential mortgage-backed
Financial Assets
Fixed maturity securities, fair value	1,001.5	954.7
U.S. corporate
Financial Assets
Fixed maturity securities, fair value	3,970.5	3,877.6
Foreign corporate
Financial Assets
Fixed maturity securities, fair value	1,769.8	1,729.4
Recurring
Financial Assets
Short-term investments	278.0	336.3
Other investments	69.5	72.2
Cash equivalents	1,156.7	1,349.3
Other assets	5.0	6.4
Total financial assets	10,490.3	10,549.0
Financial Liabilities
Other liabilities	93.6	85.0
Total financial liabilities	93.6	85.0
Recurring \| Level 1
Financial Assets
Short-term investments	269.8	329.0
Other investments	69.5	72.2
Cash equivalents	1,141.9	1,335.5
Other assets	0.0	0.0
Total financial assets	1,499.7	1,754.8
Financial Liabilities
Other liabilities	61.9	62.7
Total financial liabilities	61.9	62.7
Recurring \| Level 2
Financial Assets
Short-term investments	8.2	7.3
Other investments	0.0	0.0
Cash equivalents	14.8	13.8
Other assets	0.0	0.0
Total financial assets	8,740.7	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	5.0	6.4
Total financial assets	249.9	231.2
Financial Liabilities
Other liabilities	31.7	22.3
Total financial liabilities	31.7	22.3
Recurring \| U.S. government and government agencies and authorities
Financial Assets
Fixed maturity securities, fair value	63.1	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	63.1	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	94.8	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	94.8	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	615.0	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	615.0	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	850.1	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	713.4	715.9
Recurring \| Asset-backed \| Level 3
Financial Assets
Fixed maturity securities, fair value	136.7	129.8
Recurring \| Commercial mortgage-backed
Financial Assets
Fixed maturity securities, fair value	419.0	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	419.0	417.4
Recurring \| Commercial mortgage-backed \| Level 3
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| Residential mortgage-backed
Financial Assets
Fixed maturity securities, fair value	1,001.5	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	1,001.5	954.7
Recurring \| Residential mortgage-backed \| Level 3
Financial Assets
Fixed maturity securities, fair value	0.0	0.0
Recurring \| U.S. corporate
Financial Assets
Fixed maturity securities, fair value	3,970.5	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	3,897.8	3,812.0
Recurring \| U.S. corporate \| Level 3
Financial Assets
Fixed maturity securities, fair value	72.7	65.6
Recurring \| Foreign corporate
Financial Assets
Fixed maturity securities, fair value	1,769.8	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	1,756.3	1,721.5
Recurring \| Foreign corporate \| Level 3
Financial Assets
Fixed maturity securities, fair value	13.5	7.9
Recurring \| Mutual funds
Financial Assets
Equity securities at fair value	37.9	37.3
Recurring \| Mutual funds \| Level 1
Financial Assets
Equity securities at fair value	16.3	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	21.6	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	157.2	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	156.8	167.5
Recurring \| Non-redeemable preferred stocks \| Level 3
Financial Assets
Equity securities at fair value	$ 0.4	$ 0.3

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

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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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