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Amortized Cost and Fair Values of Securities by Security Type (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | $ 40,151.9 | $ 39,780.5
Accumulated Gross Unrealized Gain on Securities | 4,641.3 |
Accumulated Gross Unrealized Loss on Securities | 293.1 |
Fixed Maturity Securities | 44,500.1 |
United States Government and Government Agencies and Authorities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | 1,411.0 | 1,311.1
Accumulated Gross Unrealized Gain on Securities | 146.4 | 176.1
Accumulated Gross Unrealized Loss on Securities | 11.1 | 4.7
Fixed Maturity Securities | 1,546.3 | 1,482.5
States, Municipalities, and Political Subdivisions |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | 2,016.6 | 1,942.8
Accumulated Gross Unrealized Gain on Securities | 343.2 | 395.4
Accumulated Gross Unrealized Loss on Securities | 2.5 | 1.3
Fixed Maturity Securities | 2,357.3 | 2,336.9
Foreign Governments |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | 692.6 | 673.0
Accumulated Gross Unrealized Gain on Securities | 181.9 | 191.3
Accumulated Gross Unrealized Loss on Securities | 0.8 | 0.4
Fixed Maturity Securities | 873.7 | 863.9
Public Utilities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | 6,919.6 | 6,952.7
Accumulated Gross Unrealized Gain on Securities | 1,089.7 | 1,296.4
Accumulated Gross Unrealized Loss on Securities | 27.6 | 12.6
Fixed Maturity Securities | 7,981.7 | 8,236.5
Mortgage/Asset-Backed Securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | 1,776.4 | 1,873.2
Accumulated Gross Unrealized Gain on Securities | 81.1 | 105.1
Accumulated Gross Unrealized Loss on Securities | 14.7 | 4.7
Fixed Maturity Securities | 1,842.8 | 1,973.6
All Other Corporate Bonds |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | 27,296.7 | 26,988.7
Accumulated Gross Unrealized Gain on Securities | 2,796.7 | 3,633.5
Accumulated Gross Unrealized Loss on Securities | 236.4 | 99.8
Fixed Maturity Securities | 29,857.0 | 30,522.4
Redeemable Preferred Stocks |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | 39.0 | 39.0
Accumulated Gross Unrealized Gain on Securities | 2.3 | 3.0
Accumulated Gross Unrealized Loss on Securities | 0.0 | 0.0
Fixed Maturity Securities | 41.3 | 42.0
Fixed Maturity Securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost of Fixed Maturity Securities | 40,151.9 | 39,780.5
Accumulated Gross Unrealized Gain on Securities | 4,641.3 | 5,800.8
Accumulated Gross Unrealized Loss on Securities | 293.1 | 123.5
Fixed Maturity Securities | $ 44,500.1 | $ 45,457.8

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