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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
Mar. 31, 2018
Mar. 31, 2017
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Other-than-temporary impairments $ 0.0 $ (0.3)
Catastrophe bonds 0.9 0.0
Net change in gross unrealized (losses)/gains (108.8) 40.9
Total net realized and unrealized investment (losses)/gains recorded in the statement of operations (37.7) 46.2
Change in available for sale net unrealized (losses)/gains:    
Fixed income securities (82.9) 2.0
Total change in pre-tax available for sale unrealized (losses)/gains (82.9) 2.0
Change in taxes 5.5 0.1
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax (77.4) 2.1
Total fixed income securities — Available for sale    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Fixed income maturities — gross realized gains 1.8 2.2
Fixed income maturities — gross realized (losses) (1.8) (1.3)
Cash and cash equivalents - gross realized gains 0.2 0.0
Cash and cash equivalents — gross realized gains (losses) (0.1) 0.0
Fixed Income Maturities - Trading    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Cash and cash equivalents - gross realized gains 1.6 0.0
Fixed income securities - gross realized gains 1.6 1.8
Fixed income securities - gross realized (losses) (7.0) (2.0)
Equity securities — Trading    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Trading securities, gross realized gain 94.5 4.5
Equity securities — gross realized (losses) (20.3) (1.4)
Short-term investments    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Fixed income maturities — gross realized gains 0.0 0.1
MVI    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Change in fair value of investment (0.1) 0.0
Chaspark    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Change in fair value of investment 0.0 1.7
Bene    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Change in fair value of investment $ (0.2) $ 0.0