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VOBA and Other Intangible Assets (Estimated Amortization of VOBA) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Present Value of Future Insurance Profits, Amortization Expense, Next Five Years [Abstract]        
2022 $ 322.5      
2023 177.8      
2024 76.2      
2025 3.3      
2026 1.4      
Thereafter 2.2      
Total $ 583.4 $ 1,152.2 $ 1,993.7 $ 3,140.8