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Acquisition of Sirius Group - Estimated remaining amortization expense for intangible assets with finite lives (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Business Combination and Asset Acquisition [Abstract]  
2023 $ 11.1
2024 12.0
2025 11.4
2026 9.9
2027 and thereafter 71.6
Total remaining amortization expense $ 116.0