Acquisitions - Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Jan. 01, 2022	Mar. 31, 2022	Dec. 31, 2021
Liabilities:
Goodwill		$ 56.3	$ 43.5
Goodwill expected to be deductible for tax purposes	$ 18.6
Madison National
Assets:
Investments	90.4
Cash and short-term investments	123.4
Reinsurance recoverable	356.0
Intangible assets	59.4	$ 56.5
Other assets	23.2
Liabilities:
Investment contract and policy reserves	274.5
Unpaid claims and claim expenses	48.2
Unearned premiums	1.5
Other policyholder funds	152.8
Other liabilities	15.9
Total identifiable net assets acquired	159.5
Goodwill	12.8
Purchase price	$ 172.3
Minimum | Madison National
Liabilities:
Acquired finite-lived intangible assets, useful lives	1 year
Maximum | Madison National
Liabilities:
Acquired finite-lived intangible assets, useful lives	10 years