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Investments - Risk Exposure on Mortgage Backed Securities (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Subprime mortgage-backed securities
    
Concentration Risk [Line Items]    
Investments, including securities pledged, fair value $ 59.1 $ 61.2
Investments, including securities pledged, amortized cost 58.2 65.4
Investments, including securities pledged, gross unrealized losses 2.9 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 7.00% 8.00%
Subprime mortgage-backed securities | Vintage Year 2006
    
Concentration Risk [Line Items]    
Credit exposure 7.00% 6.00%
Subprime mortgage-backed securities | Vintage Year 2005 and Prior
    
Concentration Risk [Line Items]    
Credit exposure 86.00% 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 68.30% 67.80%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 2
    
Concentration Risk [Line Items]    
Credit exposure 2.70% 3.20%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 3
    
Concentration Risk [Line Items]    
Credit exposure 19.10% 19.60%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 4
    
Concentration Risk [Line Items]    
Credit exposure 9.60% 8.70%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 5
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 0.50%
Subprime mortgage-backed securities | NAIC Designation | NAIC Designation of 6
    
Concentration Risk [Line Items]    
Credit exposure 0.30% 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 2.60% 0.00%
Subprime mortgage-backed securities | Acceptable Rating Organizations | A Rating
    
Concentration Risk [Line Items]    
Credit exposure 13.00% 16.20%
Subprime mortgage-backed securities | Acceptable Rating Organizations | BBB Rating
    
Concentration Risk [Line Items]    
Credit exposure 20.80% 21.50%
Subprime mortgage-backed securities | Acceptable Rating Organizations | BB and Below Rating
    
Concentration Risk [Line Items]    
Credit exposure 63.50% 59.10%
Alt-A residential mortgage-backed securities
    
Concentration Risk [Line Items]    
Investments, including securities pledged, fair value 89.5 106.0
Investments, including securities pledged, amortized cost 73.9 89.5
Investments, including securities pledged, gross unrealized losses 4.2 9.5
Percent of total fixed maturities 0.40% 0.50%
Credit exposure 100.00% 100.00%
Alt-A residential mortgage-backed securities | Vintage Year 2007
    
Concentration Risk [Line Items]    
Credit exposure 14.30% 13.80%
Alt-A residential mortgage-backed securities | Vintage Year 2006
    
Concentration Risk [Line Items]    
Credit exposure 29.80% 29.30%
Alt-A residential mortgage-backed securities | Vintage Year 2005 and Prior
    
Concentration Risk [Line Items]    
Credit exposure 55.90% 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 43.20% 33.40%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 2
    
Concentration Risk [Line Items]    
Credit exposure 12.80% 12.40%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 3
    
Concentration Risk [Line Items]    
Credit exposure 30.60% 21.00%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 4
    
Concentration Risk [Line Items]    
Credit exposure 11.40% 30.30%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 5
    
Concentration Risk [Line Items]    
Credit exposure 2.00% 2.30%
Alt-A residential mortgage-backed securities | NAIC Designation | NAIC Designation of 6
    
Concentration Risk [Line Items]    
Credit exposure 0.00% 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 2.90% 3.40%
Alt-A residential mortgage-backed securities | Acceptable Rating Organizations | BBB Rating
    
Concentration Risk [Line Items]    
Credit exposure 3.50% 5.60%
Alt-A residential mortgage-backed securities | Acceptable Rating Organizations | BB and Below Rating
    
Concentration Risk [Line Items]    
Credit exposure 93.50% 89.40%
Commercial mortgage-backed securities
    
Concentration Risk [Line Items]    
Investments, including securities pledged, fair value 679.2 839.1
Investments, including securities pledged, amortized cost 607.8 748.7
Investments, including securities pledged, gross unrealized losses 0 0.2
Credit exposure 100.00% 100.00%
Commercial mortgage-backed securities | Vintage Year 2007
    
Concentration Risk [Line Items]    
Credit exposure 30.50% 28.70%
Commercial mortgage-backed securities | Vintage Year 2006
    
Concentration Risk [Line Items]    
Credit exposure 24.40% 20.40%
Commercial mortgage-backed securities | Vintage Year 2005 and Prior
    
Concentration Risk [Line Items]    
Credit exposure 45.10% 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 48.60% 54.10%
Commercial mortgage-backed securities | Acceptable Rating Organizations | AA Rating
    
Concentration Risk [Line Items]    
Credit exposure 14.60% 17.10%
Commercial mortgage-backed securities | Acceptable Rating Organizations | A Rating
    
Concentration Risk [Line Items]    
Credit exposure 8.00% 8.40%
Commercial mortgage-backed securities | Acceptable Rating Organizations | BBB Rating
    
Concentration Risk [Line Items]    
Credit exposure 7.10% 5.30%
Commercial mortgage-backed securities | Acceptable Rating Organizations | BB and Below Rating
    
Concentration Risk [Line Items]    
Credit exposure 21.70% 15.10%
Other asset-backed securities
    
Concentration Risk [Line Items]    
Investments, including securities pledged, fair value 498.9 495.6
Investments, including securities pledged, amortized cost 482.9 475.7
Investments, including securities pledged, gross unrealized losses 3.7 6.7
Investments, including securities pledged, excluding subprime exposure, fair value 441.0 435.6
Investments, including securities pledged, excluding subprime exposure, amortized cost 425.9 411.7
Investments, including securities pledged, excluding subprime exposure, 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 9.00%  
Other asset-backed securities | Vintage Year 2012
    
Concentration Risk [Line Items]    
Credit exposure 21.00% 21.40%
Other asset-backed securities | Vintage Year 2011
    
Concentration Risk [Line Items]    
Credit exposure 11.70% 12.20%
Other asset-backed securities | Vintage Year 2010
    
Concentration Risk [Line Items]    
Credit exposure 5.00% 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 8.10% 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 44.90%  
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 90.50% 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 6.20% 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 44.80% 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 34.70% 26.90%