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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Other-than-temporary impairments $ (0.1) $ 0.0 $ (0.5) $ 0.0
Catastrophe bonds (3.1) 0.3 (3.2) 0.1
Net change in gross unrealized (losses)/gains (25.0) 8.0 54.4 88.8
Total net realized and unrealized investment gains recorded in the statement of operations 17.5 21.5 105.7 103.3
Change in available for sale net unrealized gains:        
Fixed income securities 0.3 (23.2) 15.2 104.0
Total change in pre-tax available for sale unrealized gains 0.3 (23.2) 15.2 104.0
Change in taxes (0.4) 2.0 (1.4) (11.1)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax (0.1) (21.2) 13.8 92.9
Total fixed income securities — Available for sale        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Fixed income maturities — gross realized gains 2.3 5.5 7.8 14.7
Fixed income maturities — gross realized (losses) (1.6) (0.9) (5.3) (4.6)
Cash and cash equivalents - gross realized gains 0.3 0.0 0.3 0.1
Cash and cash equivalents — gross realized gains (losses) 0.0 0.0 (0.1) (0.5)
Fixed Income Maturities - Trading        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Cash and cash equivalents - gross realized gains 1.3 0.0 1.3 0.0
Fixed income securities - gross realized gains 3.0 4.3 8.3 9.5
Fixed income securities - gross realized (losses) (0.2) (0.5) (2.6) (6.9)
Equity securities — Trading        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Trading securities, gross realized gain 46.1 8.1 55.0 23.3
Equity securities — gross realized (losses) (7.4) (4.2) (12.4) (22.2)
Short-term investments        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Fixed income maturities — gross realized gains 0.0 0.1 0.1 0.0
Fixed income maturities — gross realized (losses) 0.0 (0.2) 0.0 0.0
Trading securities, gross realized gain 1.9 0.0 2.0 0.0
MVI        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Change in fair value of investment 0.0 0.0 (0.1) 0.0
Chaspark        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Change in fair value of investment 0.0 1.0 0.9 1.0
Bene        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Change in fair value of investment $ 0.0 $ 0.0 $ (0.2) $ 0.0