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Investing Activities - Net Realized Investment Gains/Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Gain (Loss) on Investments [Line Items]        
Total other-than-temporary debt impairments $ (0.1) $ 0.0 $ (0.2) $ 0.0
Portion of losses recognized in OCI 0.0 0.0 (0.1) 0.0
Net debt impairments recognized in earnings (0.1) 0.0 (0.3) 0.0
Impairment losses (0.1) 0.0 (0.3) 0.0
Limited partnerships and other investment transaction gains 0.0 0.0 0.0 0.0
Limited partnerships and other investment transaction losses 0.0 0.0 0.0 0.0
Net realized capital gains (losses) 8.3 0.4 13.2 1.8
Derivative instruments (11.1) 0.0 (14.4) (23.6)
Embedded derivatives 4.2 (2.3) (6.0) (15.2)
Net realized gains (losses), excluding impairment losses 1.4 (1.9) (7.2) (37.0)
Net realized gains (losses) 1.3 (1.9) (7.5) (37.0)
U.S. government and agency        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings 0.0 0.0 0.0 0.0
State and political subdivision        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings 0.0 0.0 0.0 0.0
Foreign government        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings 0.0 0.0 0.0 0.0
Corporate        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings (0.2) 0.0 (0.2) 0.0
Commercial mortgage-backed (“CMBS”)        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings 0.0 0.0 0.0 0.0
Residential mortgage-backed (“RMBS”)        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings 0.1 0.0 (0.1) 0.0
Collateralized debt obligations (“CDO”) / collateralized loan obligations (“CLO”)        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings 0.0 0.0 0.0 0.0
Other asset-backed (“ABS”)        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings 0.0 0.0 0.0 0.0
Debt securities        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings (0.1) 0.0 (0.3) 0.0
Debt and equity transaction gains 8.8 0.8 13.8 3.0
Gross investment losses from sales and maturities (0.5) (0.4) (0.6) (1.2)
Equity securities        
Gain (Loss) on Investments [Line Items]        
Net debt impairments recognized in earnings 0.0 0.0 0.0 0.0
Debt and equity transaction gains 0.0 0.0 0.0 0.0
Gross investment losses from sales and maturities 0.0 0.0 0.0 0.0
Limited partnerships and other investments        
Gain (Loss) on Investments [Line Items]        
Limited partnerships and other investment impairments $ 0.0 $ 0.0 $ 0.0 $ 0.0