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Investments Investment Portfolio by Major Security Type (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 39,750.6	$ 34,441.9	$ 33,602.3
Gross Unrealized Gains	1,266.6	517.0	688.9
Gross Unrealized Losses	(40.5)	(57.6)	(17.2)
Net Holding Period Gains (Losses)	4.6	7.8	6.1
Total available-for-sale securities	$ 40,981.3	$ 34,909.1	$ 34,280.1
% of Total Fair Value	89.60%	88.90%	88.90%
Equity securities, at Fair Value
Cost	$ 2,432.7	$ 2,096.8	$ 2,264.5
Gross Unrealized Gains	0.0	0.0	0.0
Gross Unrealized Losses	0.0	0.0	0.0
Net Holding Period Gains (Losses)	2,350.3	2,248.4	2,029.1
Fair Value	$ 4,783.0	$ 4,345.2	$ 4,293.6
% of Total Fair Value	10.40%	11.10%	11.10%
Debt and Equity Securities, at Fair Value
Cost	$ 42,183.3	$ 36,538.7	$ 35,866.8
Gross Unrealized Gains	1,266.6	517.0	688.9
Gross Unrealized Losses	(40.5)	(57.6)	(17.2)
Net Holding Period Gains (Losses)	2,354.9	2,256.2	2,035.2
Fair Value	$ 45,764.3	$ 39,254.3	$ 38,573.7
% of Total Fair Value	100.00%	100.00%	100.00%
Unsettled security transactions, payable	$ 469.2	$ 11.9	$ 286.5
Total fair value of non-insurance subsidiary portfolio	2,800.0	3,200.0	1,500.0
Nonredeemable preferred stocks
Equity securities, at Fair Value
Cost	1,302.7	971.3	1,054.2
Gross Unrealized Gains	0.0	0.0	0.0
Gross Unrealized Losses	0.0	0.0	0.0
Net Holding Period Gains (Losses)	20.5	67.6	74.3
Fair Value	$ 1,323.2	$ 1,038.9	$ 1,128.5
% of Total Fair Value	2.90%	2.70%	2.90%
Common equities
Equity securities, at Fair Value
Cost	$ 1,130.0	$ 1,125.5	$ 1,210.3
Gross Unrealized Gains	0.0	0.0	0.0
Gross Unrealized Losses	0.0	0.0	0.0
Net Holding Period Gains (Losses)	2,329.8	2,180.8	1,954.8
Fair Value	$ 3,459.8	$ 3,306.3	$ 3,165.1
% of Total Fair Value	7.50%	8.40%	8.20%
Total fixed maturities
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 35,082.8	$ 32,643.1	$ 32,134.9
Gross Unrealized Gains	1,266.6	517.0	688.9
Gross Unrealized Losses	(40.5)	(57.6)	(17.2)
Net Holding Period Gains (Losses)	4.6	7.8	6.1
Total available-for-sale securities	$ 36,313.5	$ 33,110.3	$ 32,812.7
% of Total Fair Value	79.40%	84.30%	85.10%
Total fixed maturities | U.S. government obligations
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 9,835.1	$ 13,100.7	$ 13,387.6
Gross Unrealized Gains	370.3	194.1	300.3
Gross Unrealized Losses	(1.6)	(43.7)	(9.2)
Net Holding Period Gains (Losses)	0.0	0.0	0.0
Total available-for-sale securities	$ 10,203.8	$ 13,251.1	$ 13,678.7
% of Total Fair Value	22.30%	33.70%	35.40%
Total fixed maturities | State and local government obligations
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 4,382.1	$ 1,686.0	$ 1,652.2
Gross Unrealized Gains	148.2	30.0	32.6
Gross Unrealized Losses	(0.5)	(2.7)	(1.1)
Net Holding Period Gains (Losses)	0.0	0.0	0.0
Total available-for-sale securities	$ 4,529.8	$ 1,713.3	$ 1,683.7
% of Total Fair Value	9.90%	4.40%	4.40%
Total fixed maturities | Corporate debt securities
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 10,038.7	$ 6,860.3	$ 7,048.9
Gross Unrealized Gains	574.7	206.6	231.6
Gross Unrealized Losses	(3.6)	(0.5)	(0.4)
Net Holding Period Gains (Losses)	2.2	1.3	1.0
Total available-for-sale securities	$ 10,612.0	$ 7,067.7	$ 7,281.1
% of Total Fair Value	23.20%	18.00%	18.90%
Total fixed maturities | Residential mortgage-backed securities
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 525.4	$ 625.0	$ 677.5
Gross Unrealized Gains	7.0	4.5	5.5
Gross Unrealized Losses	(1.4)	(2.0)	(1.5)
Net Holding Period Gains (Losses)	0.0	0.0	0.0
Total available-for-sale securities	$ 531.0	$ 627.5	$ 681.5
% of Total Fair Value	1.20%	1.60%	1.80%
Total fixed maturities | Commercial mortgage-backed securities
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 5,964.4	$ 5,020.7	$ 4,547.9
Gross Unrealized Gains	117.1	61.5	93.0
Gross Unrealized Losses	(27.9)	(6.0)	(1.9)
Net Holding Period Gains (Losses)	0.0	0.0	0.0
Total available-for-sale securities	$ 6,053.6	$ 5,076.2	$ 4,639.0
% of Total Fair Value	13.20%	12.90%	12.00%
Total fixed maturities | Other asset-backed securities
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 4,155.8	$ 5,164.7	$ 4,601.0
Gross Unrealized Gains	46.8	16.2	21.5
Gross Unrealized Losses	(2.3)	(1.4)	(0.6)
Net Holding Period Gains (Losses)	0.0	0.0	0.0
Total available-for-sale securities	$ 4,200.3	$ 5,179.5	$ 4,621.9
% of Total Fair Value	9.20%	13.20%	12.00%
Total fixed maturities | Redeemable preferred stocks
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 181.3	$ 185.7	$ 219.8
Gross Unrealized Gains	2.5	4.1	4.4
Gross Unrealized Losses	(3.2)	(1.3)	(2.5)
Net Holding Period Gains (Losses)	2.4	6.5	5.1
Total available-for-sale securities	$ 183.0	$ 195.0	$ 226.8
% of Total Fair Value	0.40%	0.50%	0.60%
Short-term investments
Debt Securities, Available-for-Sale, at Fair Value
Cost	$ 4,667.8	$ 1,798.8	$ 1,467.4
Gross Unrealized Gains	0.0	0.0	0.0
Gross Unrealized Losses	0.0	0.0	0.0
Net Holding Period Gains (Losses)	0.0	0.0	0.0
Total available-for-sale securities	$ 4,667.8	$ 1,798.8	$ 1,467.4
% of Total Fair Value	10.20%	4.60%	3.80%

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