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Goodwill and Other Intangible Assets - Summary of the Acquisition Date Fair Values of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
Jan. 01, 2021
Jul. 02, 2020
Apr. 07, 2020
Kingsbridge Group Limited | Specialty Insurance Distribution (NSM)      
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill and intangible assets acquired     $ 131.7
Ark | Specialty Insurance Distribution (NSM)      
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill and intangible assets acquired $ 292.5    
Other      
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill and intangible assets acquired   $ 15.2