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Investments (Financial Assets Measured At Fair Value On Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value $ 4,344.9 $ 4,147.5
Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 3,157.5 3,215.5
Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 4,206.7 4,024.4
Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 3,157.5 3,215.5
Non-U.S. Governments [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 60.0 55.6
Non-U.S. Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 60.0 55.6
Obligations Of States And Political Subdivisions [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 609.8 636.4
Obligations Of States And Political Subdivisions [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 609.8 636.4
Credit-Financial [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 390.3 383.5
Credit-Financial [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 390.3 383.5
Credit-Industrial [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 442.3 429.0
Credit-Industrial [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 442.3 429.0
Credit-Utility [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 194.7 170.2
Credit-Utility [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 194.7 170.2
CMO/MBS-Agency [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 444.5 [1] 546.5 [1]
CMO/MBS-Agency [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 444.5 546.5
CMO/MBS-Non Agency [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 14.2 18.4
CMO/MBS-Non Agency [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 14.2 18.4
CMBS [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 111.0 [2] 105.6 [2]
CMBS [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 111.0 105.6
ABS-Residential [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 10.4 [3] 13.4 [3]
ABS-Residential [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 10.4 13.4
ABS-Non Residential [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 78.3 48.0
ABS-Non Residential [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 78.3 48.0
Foreign Denominated, Governments [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 255.5 225.0
Foreign Denominated, Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 255.5 225.0
Foreign Denominated, Credit [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 129.6 88.6
Foreign Denominated, Credit [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 129.6 88.6
Equity Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 533.3 403.6
Equity Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 533.3 403.6
Other Investments [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 283.6 232.0
Other Investments [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 139.0 99.9
Short-term Investments [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 370.5 296.4
Short-term Investments [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 370.5 296.4
Other Assets [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 6.4 9.0
U.S. Governments [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 416.9 [4] 495.3 [1],[4]
U.S. Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value   495.3
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 219.2 [5]  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 1,021.4 [5] 827.8 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 219.2 [5] 214.9 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Non-U.S. Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Obligations Of States And Political Subdivisions [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Credit-Financial [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Credit-Industrial [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Credit-Utility [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | CMO/MBS-Agency [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | CMO/MBS-Non Agency [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | CMBS [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ABS-Residential [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ABS-Non Residential [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Foreign Denominated, Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Foreign Denominated, Credit [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 480.7 [5] 352.2 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Other Investments [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Short-term Investments [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 321.5 [5] 260.7 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Other Assets [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [5] 0 [5]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | U.S. Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value   214.9 [5]
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 197.7 [6]  
Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 3,177.1 [6] 3,184.5 [6]
Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 2,938.3 [6] 2,999.9 [6]
Significant Other Observable Inputs (Level 2) [Member] | Non-U.S. Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 60.0 [6] 55.6 [6]
Significant Other Observable Inputs (Level 2) [Member] | Obligations Of States And Political Subdivisions [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 609.8 [6] 636.4 [6]
Significant Other Observable Inputs (Level 2) [Member] | Credit-Financial [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 390.3 [6] 382.8 [6]
Significant Other Observable Inputs (Level 2) [Member] | Credit-Industrial [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 442.3 [6] 429.0 [6]
Significant Other Observable Inputs (Level 2) [Member] | Credit-Utility [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 194.7 [6] 170.2 [6]
Significant Other Observable Inputs (Level 2) [Member] | CMO/MBS-Agency [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 444.5 [6] 546.5 [6]
Significant Other Observable Inputs (Level 2) [Member] | CMO/MBS-Non Agency [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 14.2 [6] 18.4 [6]
Significant Other Observable Inputs (Level 2) [Member] | CMBS [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 111.0 [6] 105.6 [6]
Significant Other Observable Inputs (Level 2) [Member] | ABS-Residential [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 10.4 [6] 13.4 [6]
Significant Other Observable Inputs (Level 2) [Member] | ABS-Non Residential [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 78.3 [6] 48.0 [6]
Significant Other Observable Inputs (Level 2) [Member] | Foreign Denominated, Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 255.5 [6] 225.0 [6]
Significant Other Observable Inputs (Level 2) [Member] | Foreign Denominated, Credit [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 129.6 [6] 88.6 [6]
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 50.8 [6] 49.0 [6]
Significant Other Observable Inputs (Level 2) [Member] | Other Investments [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 139.0 [6] 99.9 [6]
Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 49.0 [6] 35.7 [6]
Significant Other Observable Inputs (Level 2) [Member] | Other Assets [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [6] 0 [6]
Significant Other Observable Inputs (Level 2) [Member] | U.S. Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value   280.4 [6]
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7]  
Significant Unobservable Inputs (Level 3) [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 8.2 [7] 12.1 [7]
Significant Unobservable Inputs (Level 3) [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0.7 [7]
Significant Unobservable Inputs (Level 3) [Member] | Non-U.S. Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | Obligations Of States And Political Subdivisions [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | Credit-Financial [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0.7 [7]
Significant Unobservable Inputs (Level 3) [Member] | Credit-Industrial [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | Credit-Utility [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | CMO/MBS-Agency [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | CMO/MBS-Non Agency [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | CMBS [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | ABS-Residential [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | ABS-Non Residential [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | Foreign Denominated, Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | Foreign Denominated, Credit [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 1.8 [7] 2.4 [7]
Significant Unobservable Inputs (Level 3) [Member] | Other Investments [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 0 [7] 0 [7]
Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member] | Available-for-sale Securities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value 6.4 [7] 9.0 [7]
Significant Unobservable Inputs (Level 3) [Member] | U.S. Governments [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value   $ 0 [7]
[1] Collateralized mortgage obligations/mortgage-backed securities ("CMO/MBS").
[2] Commercial mortgage-backed securities ("CMBS").
[3] Asset-backed securities ("ABS").
[4] (1) Includes corporate bonds backed by the Federal Deposit Insurance Corporation of $4.3 million amortized cost, $4.3 million fair value.
[5] Quoted prices in active markets for identical assets
[6] Significant other observable inputs
[7] Significant unobservable inputs