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Investments - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 USD ($) | Aug. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security | Dec. 31, 2015 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |
Principal amount of bonds and certificates of deposit on deposit to meet state insurance regulatory and/or rating agency requirements |  |  | $ 222,600,000 |  |
Securities exceeding 10% of Shareholders' Equity |  |  | 0 | $ 0 |
Fair value of fixed-maturity securities that were non-income producing during the preceding 12 months |  |  | 0 |  |
Short-term Investments |  |  | 2,869,400,000 | 3,572,900,000 |
Securities Sold under Agreements to Repurchase |  |  | 0 | 0 |
Open reverse repurchase commitments |  |  | 0 | 0 |
Gross Unrealized Losses |  |  | $ 99,400,000 | $ 139,800,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  | 1,166 | 1,369 |
Trading securities |  |  | $ 0 | $ 0 |
Net realized gains (losses) on securities |  |  | 114,100,000 | 137,900,000 | $ 136,500,000
Gain (Loss) on Derivative Instruments, Net, Pretax |  |  | 0 | (20,000,000) | (20,700,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  |  | 300,000 | 1,900,000 | 1,800,000
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 | 0 |
4.125% Senior Notes due 2047 |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Senior notes, issuance amount | $ 850,000,000 |  | $ 850,000,000 | 0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.125% |  | 4.125% |  |
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) | $ (8,000,000) |  |  |  |
2.45% Senior Notes Due 2027 |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Senior notes, issuance amount |  | $ 500,000,000 | $ 500,000,000 | 500,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.45% | 2.45% |  |
6.70% Fixed-to-Floating Rate Junior Subordinated Debentures due 2067 |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Senior notes, issuance amount |  |  | $ 0 | 1,000,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.70% |  |
Debt Instrument, Repurchased Face Amount |  |  | $ 31,000,000 | 20,000,000 | 18,000,000
Equity securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Losses |  |  | $ 9,000,000 | $ 18,200,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  | 23 | 88 |
Equity securities | Common equities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Losses |  |  | $ 200,000 | $ 2,100,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  | 19 | 75 |
Equity securities | Nonredeemable preferred stocks |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Losses |  |  | $ 8,800,000 | $ 16,100,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  | 4 | 13 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Percentage Decline |  |  | 6.00% |  |
Fixed maturities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Losses |  |  | $ 90,400,000 | $ 121,600,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  | 1,143 | 1,281 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment |  |  | $ 400,000 | $ 0 | 0
Fixed maturities | Corporate debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Losses |  |  | $ 14,400,000 | $ 24,300,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  | 222 | 184 |
Fixed maturities | Redeemable preferred stocks |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Losses |  |  | $ 1,500,000 | $ 2,000,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  | 2 | 2 |
Fixed maturities | Commercial mortgage-backed securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Losses |  |  | $ 13,300,000 | $ 25,500,000 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  |  | 105 | 111 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment |  |  | $ 400,000 | $ 0 | 0
Fixed Income Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Losses |  |  | 99,200,000 |  |
Foreign Government Debt |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Short-term Investments |  |  | 0 | 0 |
Interest Rate Swaps |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Cash collateral received from counterparty |  |  |  | 4,900,000 |
Categories of Investments, Marketable Securities, Trading Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Net realized gains (losses) on securities |  |  | $ 0 | 0 | 0
Russell One Thousand | Equity securities | Common equities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Percentage of common stock portfolio |  |  | 96.00% |  |
Managed Equity Strategy | Equity securities | Common equities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Percentage of common stock portfolio |  |  | 4.00% |  |
Designated as Hedging Instrument [Member] | Ineffective Cash Flow Hedge [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | $ 350,000,000 | $ 31,000,000 | 370,000,000 | 18,000,000
Gain (Loss) on Derivative Instruments, Net, Pretax |  |  | 0 | (1,300,000) | 200,000
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 | 0 |
Designated as Hedging Instrument [Member] | Ineffective Cash Flow Hedge [Member] | 2.45% Senior Notes Due 2027 |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | $ (1,400,000) | (1,400,000) |  |
Non-hedging Instruments | Interest Rate Swaps |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 | 0 |
Non-hedging Instruments | Future [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 | 0 |
Non-hedging Instruments | Fixed maturities | Interest Rate Swaps |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  | 0 | 0 | 750,000,000
Gain (Loss) on Derivative Instruments, Net, Pretax |  |  | 0 | 0 | $ (23,400,000)
Derivative Assets (Liabilities), at Fair Value, Net |  |  | $ 0 | $ 0 |

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