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Goodwill and Intangible Assets - Summary of Finite-Lived Intangible Assets (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Finite-Lived Intangible Assets  
Weighted Average Useful Life (in Years) 23 years
At inception: $ 174.5
Accumulated amortization and impairments: (39.9)
Total $ 134.6
Value of business acquired  
Finite-Lived Intangible Assets  
Weighted Average Useful Life (in Years) 30 years
At inception: $ 94.4
Accumulated amortization and impairments: $ (17.6)
Value of distribution acquired  
Finite-Lived Intangible Assets  
Weighted Average Useful Life (in Years) 17 years
At inception: $ 54.0
Accumulated amortization and impairments: $ (11.6)
Value of agency relationships  
Finite-Lived Intangible Assets  
Weighted Average Useful Life (in Years) 14 years
At inception: $ 17.0
Accumulated amortization and impairments: $ (6.3)
Value of customer relationships  
Finite-Lived Intangible Assets  
Weighted Average Useful Life (in Years) 10 years
At inception: $ 9.1
Accumulated amortization and impairments: $ (4.4)