Goodwill and Intangible Assets - Summary of Finite-Lived Intangible Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	20 years
At inception:	$ 231.0
Accumulated amortization and impairments:	(59.2)
Total	$ 171.8
Value of business acquired
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	28 years
At inception:	$ 100.1
Accumulated amortization and impairments:	(29.6)
Total	$ 70.5
Value of distribution acquired
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	17 years
At inception:	$ 54.0
Accumulated amortization and impairments:	$ (14.7)
Value of agency relationships
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	14 years
At inception:	$ 17.0
Accumulated amortization and impairments:	$ (8.2)
Value of customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	10 years
At inception:	$ 59.9
Accumulated amortization and impairments:	$ (6.7)