Investments - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	$ 4,110.7	$ 4,094.8
Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	21.5	24.2
Total assets	2,738.7	2,719.9
Derivatives	2.9
Total liabilities	2.9
Fair Value, Recurring \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	0.0	0.0
Total assets	882.0	727.4
Derivatives	0.0
Total liabilities	0.0
Fair Value, Recurring \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	21.5	24.2
Total assets	1,668.7	1,835.9
Derivatives	2.9
Total liabilities	2.9
Fair Value, Recurring \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	0.0	0.0
Total assets	188.0	156.6
Derivatives	0.0
Total liabilities	0.0
Fair Value, Recurring \| Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	1,915.8	2,068.9
Fair Value, Recurring \| Fixed maturities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	211.0	221.0
Fair Value, Recurring \| Fixed maturities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	1,646.9	1,811.3
Fair Value, Recurring \| Fixed maturities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	57.9	36.6
Fair Value, Recurring \| Fixed maturities \| Collateralized Loan Obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	89.2	109.3
Fair Value, Recurring \| Fixed maturities \| Collateralized Loan Obligations \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Collateralized Loan Obligations \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	85.3	109.3
Fair Value, Recurring \| Fixed maturities \| Collateralized Loan Obligations \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	3.9	0.0
Fair Value, Recurring \| Fixed maturities \| U.S. Governments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	213.2	223.2
Fair Value, Recurring \| Fixed maturities \| U.S. Governments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	211.0	221.0
Fair Value, Recurring \| Fixed maturities \| U.S. Governments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	2.2	2.2
Fair Value, Recurring \| Fixed maturities \| U.S. Governments \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Foreign Governments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	4.2	7.1
Fair Value, Recurring \| Fixed maturities \| Foreign Governments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Foreign Governments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	4.2	7.1
Fair Value, Recurring \| Fixed maturities \| Foreign Governments \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	68.1	81.7
Fair Value, Recurring \| Fixed maturities \| Obligations of states and political subdivisions \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Obligations of states and political subdivisions \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	68.1	81.7
Fair Value, Recurring \| Fixed maturities \| Obligations of states and political subdivisions \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	917.4	1,050.7
Fair Value, Recurring \| Fixed maturities \| Corporate bonds \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Corporate bonds \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	892.6	1,028.0
Fair Value, Recurring \| Fixed maturities \| Corporate bonds \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	24.8	22.7
Fair Value, Recurring \| Fixed maturities \| Commercial mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	317.4	286.3
Fair Value, Recurring \| Fixed maturities \| Commercial mortgage-backed securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Commercial mortgage-backed securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	316.3	286.3
Fair Value, Recurring \| Fixed maturities \| Commercial mortgage-backed securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	1.1	0.0
Fair Value, Recurring \| Fixed maturities \| Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	202.4	203.2
Fair Value, Recurring \| Fixed maturities \| Residential mortgage-backed securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Residential mortgage-backed securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	202.4	203.2
Fair Value, Recurring \| Fixed maturities \| Residential mortgage-backed securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	103.9	107.4
Fair Value, Recurring \| Fixed maturities \| Asset-backed securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Fixed maturities \| Asset-backed securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	75.8	93.5
Fair Value, Recurring \| Fixed maturities \| Asset-backed securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	28.1	13.9
Fair Value, Recurring \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	431.3	413.0
Fair Value, Recurring \| Equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	310.5	297.5
Fair Value, Recurring \| Equity securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Equity securities \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	120.8	115.5
Fair Value, Recurring \| Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	9.5	4.7
Fair Value, Recurring \| Other investments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.0	0.0
Fair Value, Recurring \| Other investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.2	0.2
Fair Value, Recurring \| Other investments \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	9.3	4.5
Fair Value, Recurring \| Short-term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	360.6	209.1
Fair Value, Recurring \| Short-term investments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	360.5	208.9
Fair Value, Recurring \| Short-term investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	0.1	0.2
Fair Value, Recurring \| Short-term investments \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total investments	$ 0.0	$ 0.0

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

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