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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Investment Income [Line Items]
Investment income	$ 111.9	$ 94.8
Investment expenses	8.8	9.2
Net Investment Income	103.1	85.6
Fixed Maturities
Net Investment Income [Line Items]
Investment income	69.0	71.0
Equity Securities
Net Investment Income [Line Items]
Investment income	2.1	4.3
Total Alternative Investments
Net Investment Income [Line Items]
Investment income	27.0	5.6
Equity Method Limited Liability Investments
Net Investment Income [Line Items]
Investment income	22.5	1.8
Limited Liability Investments Included in Equity Securities
Net Investment Income [Line Items]
Investment income	4.5	3.8
Short-term Investments
Net Investment Income [Line Items]
Investment income	1.2	1.6
Loans to Policyholders
Net Investment Income [Line Items]
Investment income	5.5	5.6
Real Estate
Net Investment Income [Line Items]
Investment income	2.4	2.5
Investment expenses	2.1	2.6
Other
Net Investment Income [Line Items]
Investment income	4.7	4.2
Investment expenses	$ 6.7	$ 6.6

X

- Definition

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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