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Investments - Net Realized and Unrealized Investment Gains and Losses and Change in Unrealized Gains and Losses on Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
OTTI charge recognized $ (0.1) $ 0.0 $ (0.4) $ 0.0
Catastrophe bonds (0.1) 0.0 (0.1) (0.2)
Net change in gross unrealized gains 38.5 29.4 79.4 80.8
Total net realized and unrealized investment gains recorded in the statement of operations 42.0 36.8 88.2 81.8
Change in available for sale net unrealized gains:        
Fixed income securities 12.9 42.2 14.9 127.2
Total change in pre-tax available for sale unrealized gains 12.9 42.2 14.9 127.2
Change in taxes (1.1) (5.0) (1.0) (13.1)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 11.8 37.2 13.9 114.1
Total fixed income securities — Available for sale        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Fixed income maturities — gross realized gains 3.3 2.1 5.5 9.2
Fixed income maturities — gross realized (losses) (2.4) (1.3) (3.7) (3.7)
Cash and Cash Equivalents Gross Realized Gains 0.0 0.1 0.0 0.1
Cash and cash equivalents — gross realized gains (losses) (0.1) 0.2 (0.1) (0.5)
Fixed Income Maturities - Trading        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Fixed income maturities — gross realized gains 3.5 4.0 5.3 5.2
Fixed income maturities — gross realized (losses) (0.4) (0.6) (2.4) (6.4)
Equity securities — Trading        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Trading securities, gross realized gain 4.4 9.3 8.9 15.2
Equity securities — gross realized (losses) (3.6) (6.5) (5.0) (18.0)
Short-term investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Fixed income maturities — gross realized gains 0.0 0.2 0.1 0.2
Fixed income maturities — gross realized (losses) 0.0 (0.1) 0.0 (0.1)
Trading securities, gross realized gain 0.1 0.0 0.1 0.0
MVI        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Change in fair value of investment (0.1) 0.0 (0.1) 0.0
Chaspark        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Change in fair value of investment (0.8) 0.0 0.9 0.0
Bene        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Change in fair value of investment $ (0.2) $ 0.0 $ (0.2) $ 0.0