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Summary of Accounting Policies and Accounting Changes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses	$ 4,600.8	$ 3,323.6	$ 3,188.3
Reinsurance recoverables	41.9	50.1
Accrued investment income	79.6	77.1
Company-Owned Life Insurance	448.1	327.4
Definite-lived intangible assets	706.4	607.5
Finite-lived intangible assets, net	292.9	$ 272.3
Life Insurance | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate assumptions		3.00%
Life Insurance | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate assumptions		7.00%
Value of Business Acquired
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Definite-lived intangible assets	237.5	$ 194.5
Finite-lived intangible assets, net	19.0	20.3
Customer Relationships
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Definite-lived intangible assets	43.8	39.0
Finite-lived intangible assets, net	5.7	3.4
Agent Relationships
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Definite-lived intangible assets	81.6	74.4
Finite-lived intangible assets, net	$ 58.0	$ 57.6

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