XML 54 R43.htm IDEA: XBRL DOCUMENT v3.7.0.1
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, 2017
Mar. 31, 2016
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
OTTI charge recognized $ 0.3 $ 0.0
Catastrophe bonds 0.0 (0.2)
Net change in gross unrealized gains 40.9 51.4
Total net realized and unrealized investment gains recorded in the statement of operations 46.2 45.0
Change in available for sale net unrealized gains:    
Fixed income securities 2.0 85.0
Total change in pre-tax available for sale unrealized gains 2.0 85.0
Change in taxes 0.1 (8.1)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 2.1 76.9
Total fixed income securities — Available for sale    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Fixed income maturities — gross realized gains 2.2 7.1
Fixed income maturities — gross realized (losses) (1.3) (2.4)
Cash and cash equivalents — gross realized gains (losses) 0.0 (0.7)
Fixed Income Maturities - Trading    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Fixed income maturities — gross realized gains 1.8 1.2
Fixed income maturities — gross realized (losses) (2.0) (5.8)
Equity securities    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Equity securities — gross realized gains 4.5 5.9
Equity securities — gross realized (losses) (1.4) (11.5)
Total short-term investments — Available for sale    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Fixed income maturities — gross realized gains 0.1 0.0
Chaspark    
Schedule of Investment Income, Reported Amounts, by Category [Line Items]    
Change in fair value of investment $ 1.7 $ 0.0