Amortization of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 11.3	$ 12.1
Operating Segments
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	5.8	5.9
Operating Segments | Specialty Property & Casualty Insurance
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	4.2	4.7
Operating Segments | Life Insurance
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	1.6	1.2
Corporate and Other
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	4.9	5.9
Non-Core Operations
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 0.6	$ 0.3