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Investments Investment Portfolio by Major Security Type (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 25,276.9 | $ 22,031.7
Gross Unrealized Gains | 2,097.0 | 1,588.9
Gross Unrealized Losses | (99.4) | (139.8)
Net Realized Gains (Losses) | 0.2 | 1.8
Fair Value | $ 27,274.7 | $ 23,482.6
% of Total Fair Value | 100.00% | 100.00%
Other Receivables from Broker-Dealers and Clearing Organizations | $ 5.8 |
Other Payables to Broker-Dealers and Clearing Organizations |  | $ 27.8
Securities Held In Consolidated Non-Insurance Subsidiary | 1,600.0 | 1,300.0
Fixed maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 20,209.9 | 16,287.1
Gross Unrealized Gains | 82.0 | 76.5
Gross Unrealized Losses | (90.4) | (121.6)
Net Realized Gains (Losses) | 0.2 | 1.8
Fair Value | $ 20,201.7 | $ 16,243.8
% of Total Fair Value | 74.10% | 69.20%
Fixed maturities | U.S. government obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 6,688.8 | $ 2,899.2
Gross Unrealized Gains | 1.1 | 0.0
Gross Unrealized Losses | (44.0) | (29.1)
Net Realized Gains (Losses) | 0.0 | 0.0
Fair Value | $ 6,645.9 | $ 2,870.1
% of Total Fair Value | 24.40% | 12.20%
Fixed maturities | State and local government obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 2,285.6 | $ 2,509.5
Gross Unrealized Gains | 20.7 | 13.8
Gross Unrealized Losses | (9.3) | (20.7)
Net Realized Gains (Losses) | 0.1 | 0.0
Fair Value | $ 2,297.1 | $ 2,502.6
% of Total Fair Value | 8.40% | 10.70%
Fixed maturities | Foreign government obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 0.0 | $ 24.5
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Net Realized Gains (Losses) | 0.0 | 0.0
Fair Value | $ 0.0 | $ 24.5
% of Total Fair Value | 0.00% | 0.10%
Fixed maturities | Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 4,997.2 | $ 4,557.8
Gross Unrealized Gains | 14.8 | 17.3
Gross Unrealized Losses | (14.4) | (24.3)
Net Realized Gains (Losses) | 0.1 | 0.1
Fair Value | $ 4,997.7 | $ 4,550.9
% of Total Fair Value | 18.30% | 19.40%
Fixed maturities | Residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 828.8 | $ 1,489.7
Gross Unrealized Gains | 11.3 | 23.7
Gross Unrealized Losses | (3.4) | (15.6)
Net Realized Gains (Losses) | 0.0 | 1.5
Fair Value | $ 836.7 | $ 1,499.3
% of Total Fair Value | 3.10% | 6.40%
Fixed maturities | Commercial mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 2,760.1 | $ 2,266.9
Gross Unrealized Gains | 11.8 | 12.0
Gross Unrealized Losses | (13.3) | (25.5)
Net Realized Gains (Losses) | 0.0 | 0.0
Fair Value | $ 2,758.6 | $ 2,253.4
% of Total Fair Value | 10.10% | 9.60%
Fixed maturities | Other asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 2,454.5 | $ 2,350.7
Gross Unrealized Gains | 4.5 | 4.6
Gross Unrealized Losses | (4.5) | (4.4)
Net Realized Gains (Losses) | 0.2 | 0.2
Fair Value | $ 2,454.7 | $ 2,351.1
% of Total Fair Value | 9.00% | 10.00%
Fixed maturities | Redeemable preferred stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 194.9 | $ 188.8
Gross Unrealized Gains | 17.8 | 5.1
Gross Unrealized Losses | (1.5) | (2.0)
Net Realized Gains (Losses) | (0.2) | 0.0
Fair Value | $ 211.0 | $ 191.9
% of Total Fair Value | 0.80% | 0.80%
Equity securities | Nonredeemable preferred stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 698.6 | $ 734.2
Gross Unrealized Gains | 114.0 | 135.4
Gross Unrealized Losses | (8.8) | (16.1)
Net Realized Gains (Losses) | 0.0 | 0.0
Fair Value | $ 803.8 | $ 853.5
% of Total Fair Value | 2.90% | 3.60%
Equity securities | Common equities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 1,499.0 | $ 1,437.5
Gross Unrealized Gains | 1,901.0 | 1,377.0
Gross Unrealized Losses | (0.2) | (2.1)
Net Realized Gains (Losses) | 0.0 | 0.0
Fair Value | $ 3,399.8 | $ 2,812.4
% of Total Fair Value | 12.50% | 12.00%
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 2,869.4 | $ 3,572.9
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Net Realized Gains (Losses) | 0.0 | 0.0
Fair Value | $ 2,869.4 | $ 3,572.9
% of Total Fair Value | 10.50% | 15.20%

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