Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Oct. 01, 2022	Oct. 01, 2020	Oct. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2022
Goodwill [Line Items]
Goodwill impairment	$ 2.0			$ 2.0	$ 0.0	$ 5.6
Impairment of infinite lived intangible assets				$ 0.3
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]				Other expense - goodwill and intangible asset impairments
Trade names
Goodwill [Line Items]
Impairment of infinite lived intangible assets				$ 0.3
Benefit Consultants Group Inc.
Goodwill [Line Items]
Goodwill impairment			$ 5.6
Intangible assets				9.1
Benefit Consultants Group Inc. | Trade names
Goodwill [Line Items]
Impairment of infinite lived intangible assets		$ 0.8		0.3
Benefit Consultants Group Inc. | Value of customer relationships
Goodwill [Line Items]
Impairment of finite lived intangible assets				2.5
Benefit Consultants Group Inc. | Value of business acquired
Goodwill [Line Items]
Impairment of finite lived intangible assets		3.6
Benefit Consultants Group Inc. | Retirement
Goodwill [Line Items]
Goodwill impairment	$ 2.0	$ 5.6
Benefits Consultants Group System Inc.
Goodwill [Line Items]
Intangible assets				5.0
NTA
Goodwill [Line Items]
Intangible assets				160.4
Madison National
Goodwill [Line Items]
Intangible assets				$ 56.5			$ 59.4