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Investments - Risk Exposure on Mortgage Backed Securities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Concentration Risk [Line Items]    
Fair value of investments $ 20,439.7 $ 21,378.3
Gross unrealized losses 320.9 52.6
Subprime mortgage-backed securities
    
Concentration Risk [Line Items]    
Fair value of investments 62.0 61.2
Gross unrealized losses 3.1 6.2
Percent of total fixed maturities 0.30% 0.30%
Credit exposure 100.00% 100.00%
Subprime mortgage-backed securities | Vintage Year 2007
    
Concentration Risk [Line Items]    
Credit exposure 7.60% 8.00%
Subprime mortgage-backed securities | Vintage Year 2006
    
Concentration Risk [Line Items]    
Credit exposure 6.80% 6.00%
Subprime mortgage-backed securities | Vintage Year 2005 and Prior
    
Concentration Risk [Line Items]    
Credit exposure 85.60% 86.00%
Subprime mortgage-backed securities | NAIC Designation
    
Concentration Risk [Line Items]    
Credit exposure 100.00% 100.00%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 1
    
Concentration Risk [Line Items]    
Credit exposure 67.50% 67.80%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 2
    
Concentration Risk [Line Items]    
Credit exposure 3.10% 3.20%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 3
    
Concentration Risk [Line Items]    
Credit exposure 18.90% 19.60%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 4
    
Concentration Risk [Line Items]    
Credit exposure 9.10% 8.70%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 5
    
Concentration Risk [Line Items]    
Credit exposure 1.20% 0.50%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 6
    
Concentration Risk [Line Items]    
Credit exposure 0.20% 0.20%
Subprime mortgage-backed securities | Acceptable Rating Organizations
    
Concentration Risk [Line Items]    
Credit exposure 100.00% 100.00%
Subprime mortgage-backed securities | Acceptable Rating Organizations | AAA Rating
    
Concentration Risk [Line Items]    
Credit exposure 0.10% 3.20%
Subprime mortgage-backed securities | Acceptable Rating Organizations | AA Rating
    
Concentration Risk [Line Items]    
Credit exposure 2.90% 0.00%
Subprime mortgage-backed securities | Acceptable Rating Organizations | A Rating
    
Concentration Risk [Line Items]    
Credit exposure 13.90% 16.20%
Subprime mortgage-backed securities | Acceptable Rating Organizations | BBB Rating
    
Concentration Risk [Line Items]    
Credit exposure 20.30% 21.50%
Subprime mortgage-backed securities | Acceptable Rating Organizations | BB and Below Rating
    
Concentration Risk [Line Items]    
Credit exposure 62.80% 59.10%
Alt-A residential mortgage-backed securities
    
Concentration Risk [Line Items]    
Fair value of investments 94.7 106.0
Gross unrealized losses 5.2 9.5
Percent of total fixed maturities 0.50% 0.50%
Credit exposure 100.00% 100.00%
Alt-A residential mortgage-backed securities | Vintage Year 2007
    
Concentration Risk [Line Items]    
Credit exposure 14.00% 13.80%
Alt-A residential mortgage-backed securities | Vintage Year 2006
    
Concentration Risk [Line Items]    
Credit exposure 29.50% 29.30%
Alt-A residential mortgage-backed securities | Vintage Year 2005 and Prior
    
Concentration Risk [Line Items]    
Credit exposure 56.50% 56.90%
Alt-A residential mortgage-backed securities | NAIC Designation
    
Concentration Risk [Line Items]    
Credit exposure 100.00% 100.00%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 1
    
Concentration Risk [Line Items]    
Credit exposure 40.80% 33.40%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 2
    
Concentration Risk [Line Items]    
Credit exposure 14.10% 12.40%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 3
    
Concentration Risk [Line Items]    
Credit exposure 28.70% 21.00%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 4
    
Concentration Risk [Line Items]    
Credit exposure 14.50% 30.30%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 5
    
Concentration Risk [Line Items]    
Credit exposure 1.40% 2.30%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 6
    
Concentration Risk [Line Items]    
Credit exposure 0.50% 0.60%
Alt-A residential mortgage-backed securities | Acceptable Rating Organizations
    
Concentration Risk [Line Items]    
Credit exposure 100.00% 100.00%
Alt-A residential mortgage-backed securities | Acceptable Rating Organizations | AAA Rating
    
Concentration Risk [Line Items]    
Credit exposure 0.10% 0.20%
Alt-A residential mortgage-backed securities | Acceptable Rating Organizations | AA Rating
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 1.40%
Alt-A residential mortgage-backed securities | Acceptable Rating Organizations | A Rating
    
Concentration Risk [Line Items]    
Credit exposure 3.50% 3.40%
Alt-A residential mortgage-backed securities | Acceptable Rating Organizations | BBB Rating
    
Concentration Risk [Line Items]    
Credit exposure 3.20% 5.60%
Alt-A residential mortgage-backed securities | Acceptable Rating Organizations | BB and Below Rating
    
Concentration Risk [Line Items]    
Credit exposure 93.20% 89.40%
Commercial mortgage-backed securities
    
Concentration Risk [Line Items]    
Fair value of investments 745.2 839.1
Gross unrealized losses 0.1 0.2
Credit exposure 100.00% 100.00%
Commercial mortgage-backed securities | Vintage Year 2007
    
Concentration Risk [Line Items]    
Credit exposure 30.40% 28.70%
Commercial mortgage-backed securities | Vintage Year 2006
    
Concentration Risk [Line Items]    
Credit exposure 22.50% 20.40%
Commercial mortgage-backed securities | Vintage Year 2005 and Prior
    
Concentration Risk [Line Items]    
Credit exposure 47.10% 50.90%
Commercial mortgage-backed securities | NAIC Designation
    
Concentration Risk [Line Items]    
Credit exposure 100.00% 100.00%
Commercial mortgage-backed securities | NAIC Designation | NAIC Designation of 1
    
Concentration Risk [Line Items]    
Credit exposure 99.40% 99.90%
Commercial mortgage-backed securities | NAIC Designation | NAIC Designation of 2
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 0.00%
Commercial mortgage-backed securities | NAIC Designation | NAIC Designation of 3
    
Concentration Risk [Line Items]    
Credit exposure 0.60% 0.10%
Commercial mortgage-backed securities | NAIC Designation | NAIC Designation of 4
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 0.00%
Commercial mortgage-backed securities | NAIC Designation | NAIC Designation of 5
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 0.00%
Commercial mortgage-backed securities | NAIC Designation | NAIC Designation of 6
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 0.00%
Commercial mortgage-backed securities | Acceptable Rating Organizations
    
Concentration Risk [Line Items]    
Credit exposure 100.00% 100.00%
Commercial mortgage-backed securities | Acceptable Rating Organizations | AAA Rating
    
Concentration Risk [Line Items]    
Credit exposure 50.80% 54.10%
Commercial mortgage-backed securities | Acceptable Rating Organizations | AA Rating
    
Concentration Risk [Line Items]    
Credit exposure 15.90% 17.10%
Commercial mortgage-backed securities | Acceptable Rating Organizations | A Rating
    
Concentration Risk [Line Items]    
Credit exposure 9.80% 8.40%
Commercial mortgage-backed securities | Acceptable Rating Organizations | BBB Rating
    
Concentration Risk [Line Items]    
Credit exposure 3.80% 5.30%
Commercial mortgage-backed securities | Acceptable Rating Organizations | BB and Below Rating
    
Concentration Risk [Line Items]    
Credit exposure 19.70% 15.10%
Other asset-backed securities
    
Concentration Risk [Line Items]    
Fair value of investments 436.3 435.6
Gross unrealized losses $ 0.8 $ 0.6
Credit exposure 100.00% 100.00%
Other asset-backed securities | Vintage Year 2013
    
Concentration Risk [Line Items]    
Credit exposure 6.20%  
Other asset-backed securities | Vintage Year 2012
    
Concentration Risk [Line Items]    
Credit exposure 21.20% 21.40%
Other asset-backed securities | Vintage Year 2011
    
Concentration Risk [Line Items]    
Credit exposure 12.00% 12.20%
Other asset-backed securities | Vintage Year 2010
    
Concentration Risk [Line Items]    
Credit exposure 5.40% 5.70%
Other asset-backed securities | Vintage Year 2009
    
Concentration Risk [Line Items]    
Credit exposure 0.30% 0.30%
Other asset-backed securities | Vintage Year 2008
    
Concentration Risk [Line Items]    
Credit exposure 8.70% 9.50%
Other asset-backed securities | Vintage Year 2007
    
Concentration Risk [Line Items]    
Credit exposure   22.90%
Other asset-backed securities | Vintage Year 2007 and prior
    
Concentration Risk [Line Items]    
Credit exposure 46.20%  
Other asset-backed securities | Vintage Year 2006 and prior
    
Concentration Risk [Line Items]    
Credit exposure   28.00%
Other asset-backed securities | NAIC Designation
    
Concentration Risk [Line Items]    
Credit exposure 100.00% 100.00%
Other asset-backed securities | NAIC Designation | NAIC Designation of 1
    
Concentration Risk [Line Items]    
Credit exposure 99.40% 98.30%
Other asset-backed securities | NAIC Designation | NAIC Designation of 2
    
Concentration Risk [Line Items]    
Credit exposure 0.50% 1.60%
Other asset-backed securities | NAIC Designation | NAIC Designation of 3
    
Concentration Risk [Line Items]    
Credit exposure 0.10% 0.10%
Other asset-backed securities | NAIC Designation | NAIC Designation of 4
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 0.00%
Other asset-backed securities | NAIC Designation | NAIC Designation of 5
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 0.00%
Other asset-backed securities | NAIC Designation | NAIC Designation of 6
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 0.00%
Other asset-backed securities | Acceptable Rating Organizations
    
Concentration Risk [Line Items]    
Credit exposure 100.00% 100.00%
Other asset-backed securities | Acceptable Rating Organizations | AAA Rating
    
Concentration Risk [Line Items]    
Credit exposure 90.40% 88.40%
Other asset-backed securities | Acceptable Rating Organizations | AA Rating
    
Concentration Risk [Line Items]    
Credit exposure 2.70% 1.90%
Other asset-backed securities | Acceptable Rating Organizations | A Rating
    
Concentration Risk [Line Items]    
Credit exposure 6.30% 8.00%
Other asset-backed securities | Acceptable Rating Organizations | BBB Rating
    
Concentration Risk [Line Items]    
Credit exposure 0.50% 1.60%
Other asset-backed securities | Acceptable Rating Organizations | BB and Below Rating
    
Concentration Risk [Line Items]    
Credit exposure 0.10% 0.10%
Credit Card Receivables
    
Concentration Risk [Line Items]    
Percent of total fixed maturities 45.70% 47.00%
Nonconsolidated Collateralized Loan Obligations
    
Concentration Risk [Line Items]    
Percent of total fixed maturities 3.80% 5.60%
Automobile Receivables
    
Concentration Risk [Line Items]    
Percent of total fixed maturities 32.70% 26.90%