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Goodwill and Intangible Assets - Summary of Finite-Lived Intangible Assets (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Weighted Average useful Life (in Years) 23 years
At inception $ 174.5
Accumulated amortization (33.4)
Total $ 141.1
Value of business acquired  
Finite-Lived Intangible Assets [Line Items]  
Weighted Average useful Life (in Years) 30 years
At inception $ 94.4
Accumulated amortization $ (14.3)
Value of distribution acquired  
Finite-Lived Intangible Assets [Line Items]  
Weighted Average useful Life (in Years) 17 years
At inception $ 54.0
Accumulated amortization $ (10.2)
Value of agency relationships  
Finite-Lived Intangible Assets [Line Items]  
Weighted Average useful Life (in Years) 14 years
At inception $ 17.0
Accumulated amortization $ (5.2)
Value of customer relationships  
Finite-Lived Intangible Assets [Line Items]  
Weighted Average useful Life (in Years) 10 years
At inception $ 9.1
Accumulated amortization $ (3.7)