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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	Mar. 31, 2018	Dec. 31, 2017
Statement [Line Items]
Cost or Amortized Cost	$ 5,519.9	$ 5,291.2
Gross Unrealized Gains	33.9	63.6
Gross Unrealized Losses	(87.0)	(33.9)
Fair Market Value	5,466.8	5,320.9
Total fixed income securities — Available for sale
Statement [Line Items]
Cost or Amortized Cost	5,465.2	5,201.2
Gross Unrealized Gains	33.9	63.6
Gross Unrealized Losses	(86.9)	(33.8)
Fair Market Value	5,412.2	5,231.0
Total short-term investments — Available for sale
Statement [Line Items]
Cost or Amortized Cost	54.7	90.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Fair Market Value	54.6	89.9
U.S. government
Statement [Line Items]
Cost or Amortized Cost	1,311.3	1,166.5
Gross Unrealized Gains	2.5	4.5
Gross Unrealized Losses	(21.6)	(11.6)
Fair Market Value	1,292.2	1,159.4
U.S. agency
Statement [Line Items]
Cost or Amortized Cost	52.9	51.8
Gross Unrealized Gains	0.2	0.5
Gross Unrealized Losses	(0.4)	(0.2)
Fair Market Value	52.7	52.1
Municipal
Statement [Line Items]
Cost or Amortized Cost	46.5	53.0
Gross Unrealized Gains	1.7	2.1
Gross Unrealized Losses	(0.6)	(0.2)
Fair Market Value	47.6	54.9
Corporate
Statement [Line Items]
Cost or Amortized Cost	2,471.3	2,391.4
Gross Unrealized Gains	16.3	36.1
Gross Unrealized Losses	(41.4)	(11.8)
Fair Market Value	2,446.2	2,415.7
Non-U.S. government-backed corporate
Statement [Line Items]
Cost or Amortized Cost	98.2	91.5
Gross Unrealized Gains	0.1	0.3
Gross Unrealized Losses	(0.5)	(0.5)
Fair Market Value	97.8	91.3
Non-U.S. government
Statement [Line Items]
Cost or Amortized Cost	480.7	479.7
Gross Unrealized Gains	4.5	6.4
Gross Unrealized Losses	(1.8)	(1.2)
Fair Market Value	483.4	484.9
Asset-backed
Statement [Line Items]
Cost or Amortized Cost	18.7	26.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.2)	(0.1)
Fair Market Value	18.5	26.2
Agency mortgage-backed
Statement [Line Items]
Cost or Amortized Cost	985.6	941.0
Gross Unrealized Gains	8.6	13.7
Gross Unrealized Losses	(20.4)	(8.2)
Fair Market Value	$ 973.8	$ 946.5

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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