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Investments Components of Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net Investment Income [Line Items]
Gross investment income	$ 230.5	$ 263.0	$ 715.5	$ 777.2
Investment expenses	(4.7)	(5.9)	(14.5)	(18.3)
Net Investment Income	225.8	257.1	701.0	758.9
Available-for-sale Securities
Net Investment Income [Line Items]
Gross investment income	201.2	233.0	629.4	688.6
Total equity securities
Net Investment Income [Line Items]
Gross investment income	29.3	30.0	86.1	88.6
Total equity securities | Nonredeemable preferred stocks
Net Investment Income [Line Items]
Gross investment income	15.8	15.9	44.3	47.3
Total equity securities | Common equities
Net Investment Income [Line Items]
Gross investment income	13.5	14.1	41.8	41.3
Total fixed maturities
Net Investment Income [Line Items]
Gross investment income	195.0	225.9	602.5	654.3
Total fixed maturities | U.S. government obligations
Net Investment Income [Line Items]
Gross investment income	36.7	75.8	135.0	198.7
Total fixed maturities | State and local government obligations
Net Investment Income [Line Items]
Gross investment income	18.5	8.7	44.2	26.9
Total fixed maturities | Corporate debt securities
Net Investment Income [Line Items]
Gross investment income	76.6	65.1	211.2	209.8
Total fixed maturities | Residential mortgage-backed securities
Net Investment Income [Line Items]
Gross investment income	0.8	5.4	8.8	16.6
Total fixed maturities | Commercial mortgage-backed securities
Net Investment Income [Line Items]
Gross investment income	37.3	35.6	114.2	100.7
Total fixed maturities | Other asset-backed securities
Net Investment Income [Line Items]
Gross investment income	22.6	31.4	76.6	85.5
Total fixed maturities | Redeemable preferred stocks
Net Investment Income [Line Items]
Gross investment income	2.5	3.9	12.5	16.1
Short-term investments
Net Investment Income [Line Items]
Gross investment income	$ 6.2	$ 7.1	$ 26.9	$ 34.3

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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