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Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities, Short-Term Investments and Equities (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Statement [Line Items]
Cost or Amortized Cost	$ 5,340.1	$ 5,765.4
Gross Unrealized Gains	81.9	85.3
Gross Unrealized Losses	(22.2)	(40.8)
Fair Market Value	5,399.8	5,809.9
Total fixed income securities — Available for sale
Statement [Line Items]
Cost or Amortized Cost	5,305.7	5,620.1
Gross Unrealized Gains	81.9	85.3
Gross Unrealized Losses	(22.2)	(40.8)
Fair Market Value	5,365.4	5,664.6
Total short-term investments — Available for sale
Statement [Line Items]
Cost or Amortized Cost	34.4	145.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Market Value	34.4	145.3
U.S. government
Statement [Line Items]
Cost or Amortized Cost	1,171.3	1,207.9
Gross Unrealized Gains	7.6	9.4
Gross Unrealized Losses	(6.2)	(11.2)
Fair Market Value	1,172.7	1,206.1
U.S. agency
Statement [Line Items]
Cost or Amortized Cost	61.3	117.7
Gross Unrealized Gains	0.9	1.9
Gross Unrealized Losses	(0.1)	0.0
Fair Market Value	62.1	119.6
Municipal
Statement [Line Items]
Cost or Amortized Cost	47.9	23.2
Gross Unrealized Gains	2.2	1.6
Gross Unrealized Losses	0.0	(0.4)
Fair Market Value	50.1	24.4
Corporate
Statement [Line Items]
Cost or Amortized Cost	2,431.5	2,566.9
Gross Unrealized Gains	45.4	39.6
Gross Unrealized Losses	(8.6)	(20.0)
Fair Market Value	2,468.3	2,586.5
Non-U.S. government-backed corporate
Statement [Line Items]
Cost or Amortized Cost	94.0	89.2
Gross Unrealized Gains	0.4	0.7
Gross Unrealized Losses	(0.4)	(0.1)
Fair Market Value	94.0	89.8
Non-U.S. government
Statement [Line Items]
Cost or Amortized Cost	525.3	477.7
Gross Unrealized Gains	7.9	11.8
Gross Unrealized Losses	(1.5)	(0.8)
Fair Market Value	531.7	488.7
Asset-backed
Statement [Line Items]
Cost or Amortized Cost	33.6	62.6
Gross Unrealized Gains	0.1	0.4
Gross Unrealized Losses	0.0	0.0
Fair Market Value	33.7	63.0
Non-agency commercial mortgage-backed
Statement [Line Items]
Cost or Amortized Cost		12.3
Gross Unrealized Gains		0.3
Gross Unrealized Losses		0.0
Fair Market Value		12.6
Agency mortgage-backed
Statement [Line Items]
Cost or Amortized Cost	940.8	1,062.6
Gross Unrealized Gains	17.4	19.6
Gross Unrealized Losses	(5.4)	(8.3)
Fair Market Value	$ 952.8	$ 1,073.9

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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-Publisher FASB
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