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Acquisition of Sirius Group - Estimated remaining amortization expense for intangible assets with finite lives (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Business Combination and Asset Acquisition [Abstract]  
2022 $ 8.0
2023 11.1
2024 12.0
2025 11.4
2026 and thereafter 81.6
Total remaining amortization expense $ 124.1