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Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Trading Investments in Fixed Income Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Statement [Line Items]    
Fair Market Value $ 1,313.2 $ 1,265.7
U.S. government    
Statement [Line Items]    
Cost or Amortized Cost 94.8 82.8
Gross Unrealized Gains 0.7 0.4
Gross Unrealized Losses (0.1) (0.8)
Fair Market Value 95.4 82.4
Municipal    
Statement [Line Items]    
Cost or Amortized Cost 15.7 15.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (0.1) (0.2)
Fair Market Value 15.6 15.5
Corporate    
Statement [Line Items]    
Cost or Amortized Cost 858.6 817.8
Gross Unrealized Gains 12.4 9.9
Gross Unrealized Losses (4.8) (7.1)
Fair Market Value 866.2 820.6
Non-U.S. government    
Statement [Line Items]    
Cost or Amortized Cost 187.2 203.4
Gross Unrealized Gains 5.7 3.5
Gross Unrealized Losses (1.2) (4.1)
Fair Market Value 191.7 202.8
Asset-backed    
Statement [Line Items]    
Cost or Amortized Cost 13.4 14.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Market Value 13.4 14.5
Agency mortgage-backed    
Statement [Line Items]    
Cost or Amortized Cost 132.0 130.6
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses (1.2) (0.9)
Fair Market Value 130.9 129.9
Total fixed income securities — Trading    
Statement [Line Items]    
Cost or Amortized Cost 1,301.7 1,264.8
Gross Unrealized Gains 18.9 14.0
Gross Unrealized Losses (7.4) (13.1)
Fair Market Value 1,313.2 1,265.7
Total short-term investments — Trading    
Statement [Line Items]    
Cost or Amortized Cost 184.7 185.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (0.1) 0.0
Fair Market Value 184.6 185.4
Total equity securities — Trading    
Statement [Line Items]    
Cost or Amortized Cost 563.2 554.3
Gross Unrealized Gains 78.3 55.4
Gross Unrealized Losses (17.9) (25.0)
Fair Market Value 623.6 584.7
Total catastrophe bonds — Trading    
Statement [Line Items]    
Cost or Amortized Cost 41.8 42.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Market Value 41.8 42.5
Total    
Statement [Line Items]    
Cost or Amortized Cost 2,091.4 2,047.0
Gross Unrealized Gains 97.2 69.4
Gross Unrealized Losses (25.4) (38.1)
Fair Market Value $ 2,163.2 $ 2,078.3