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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Investment Income [Line Items]
Investment income	$ 96.9	$ 96.8	$ 285.4	$ 263.9
Investment expenses	5.2	4.8	15.0	14.3
Net investment income	91.7	92.0	270.4	249.6
Fixed Maturities
Net Investment Income [Line Items]
Investment income	73.5	70.6	225.5	197.4
Equity Securities
Net Investment Income [Line Items]
Investment income	5.2	2.5	14.6	7.0
Total Alternative Investments
Net Investment Income [Line Items]
Investment income	6.8	13.3	13.5	30.9
Equity Method Limited Liability Investments
Net Investment Income [Line Items]
Investment income	1.6	(0.4)	0.6	8.1
Limited Liability Investments Included in Equity Securities
Net Investment Income [Line Items]
Investment income	5.2	13.7	12.9	22.8
Short-term Investments
Net Investment Income [Line Items]
Investment income	2.5	2.3	6.9	4.3
Loans to Policyholders
Net Investment Income [Line Items]
Investment income	5.9	5.5	16.9	16.5
Real Estate
Net Investment Income [Line Items]
Investment income	2.4	2.4	7.1	7.2
Investment expenses	2.5	2.6	7.2	7.5
Other
Net Investment Income [Line Items]
Investment income	0.6	0.2	0.9	0.6
Investment expenses	$ 2.7	$ 2.2	$ 7.8	$ 6.8

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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