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Investments Components of Net Realized Gains (Losses) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | $ 175.9 | $ 193.9 | $ 192.9
Gross realized losses on securities sales | (64.7) | (40.0) | (49.9)
Net realized gains (losses) on securities sales | 111.2 | 153.9 | 143.0
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales | (61.2) | (85.3) | (8.7)
Other gains (losses) | (0.4) | (17.5) | (21.6)
Total net realized gains (losses) on securities | 49.6 | 51.1 | 112.7
Fixed maturities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 74.5 | 120.6 | 77.2
Gross realized losses on securities sales | (46.4) | (18.9) | (8.3)
Net realized gains (losses) on securities sales | 28.1 | 101.7 | 68.9
Fixed maturities | U.S. government obligations |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 6.2 | 24.6 | 17.5
Gross realized losses on securities sales | (28.7) | (2.4) | (0.9)
Net realized gains (losses) on securities sales | (22.5) | 22.2 | 16.6
Fixed maturities | State and local government obligations |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 10.5 | 16.0 | 7.8
Gross realized losses on securities sales | (0.1) | (1.6) | (0.3)
Net realized gains (losses) on securities sales | 10.4 | 14.4 | 7.5
Fixed maturities | Corporate And Other Debt Securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 20.3 | 43.3 | 31.2
Gross realized losses on securities sales | (5.1) | (2.5) | (5.0)
Net realized gains (losses) on securities sales | 15.2 | 40.8 | 26.2
Fixed maturities | Residential mortgage-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 23.8 | 2.5 | 4.9
Gross realized losses on securities sales | (0.4) | (0.2) | (0.8)
Net realized gains (losses) on securities sales | 23.4 | 2.3 | 4.1
Fixed maturities | Commercial mortgage-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 4.9 | 13.3 | 15.7
Gross realized losses on securities sales | (5.3) | (5.6) | (1.3)
Net realized gains (losses) on securities sales | (0.4) | 7.7 | 14.4
Fixed maturities | Other asset-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 0.3 | 0.0 | 0.0
Gross realized losses on securities sales | (0.4) | 0.0 | 0.0
Net realized gains (losses) on securities sales | (0.1) | 0.0 | 0.0
Fixed maturities | Redeemable preferred stocks |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 8.5 | 20.9 | 0.1
Gross realized losses on securities sales | (6.4) | (6.6) | 0.0
Net realized gains (losses) on securities sales | 2.1 | 14.3 | 0.1
Equity securities | Nonredeemable preferred stocks |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 58.4 | 11.9 | 65.3
Gross realized losses on securities sales | (5.9) | (5.3) | (3.2)
Net realized gains (losses) on securities sales | 52.5 | 6.6 | 62.1
Equity securities | Common equities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 43.0 | 61.3 | 50.4
Gross realized losses on securities sales | (12.2) | (15.7) | (38.4)
Net realized gains (losses) on securities sales | 30.8 | 45.6 | 12.0
Short-term investments |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Gross realized gains on securities sales | 0.0 | 0.1 | 0.0
Gross realized losses on securities sales | (0.2) | (0.1) | 0.0
Net realized gains (losses) on securities sales | (0.2) | 0.0 | 0.0
Hybrid and Derivative Instruments and Litigation Settlements | Litigation Settlements |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other gains (losses) | 1.2 | 0.4 | 0.4
Hybrid and Derivative Instruments and Litigation Settlements | Hybrid Preferred Stock |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other gains (losses) | (1.6) | 2.1 | (1.3)
Hybrid and Derivative Instruments and Litigation Settlements | Derivative Instruments |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other gains (losses) | 0.0 | (20.0) | (20.7)
Investment [Domain] |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales | (11.6) | (25.6) | (8.7)
Investment [Domain] | Fixed maturities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales | (0.4) | (25.3) | 0.0
Investment [Domain] | Fixed maturities | Commercial mortgage-backed securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales | (0.4) | 0.0 | 0.0
Investment [Domain] | Fixed maturities | Redeemable preferred stocks |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales | 0.0 | (25.3) | 0.0
Investment [Domain] | Equity securities | Common equities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales | (11.2) | (0.3) | (8.7)
Other Assets [Member] | Other Assets [Member] |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales | $ (49.6) | $ (59.7) | $ 0.0

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