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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	Dec. 31, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	$ 5,291.2	$ 5,765.4
Gross Unrealized Gains	63.6	85.3
Gross Unrealized Losses	(33.9)	(40.8)
Fair Market Value	5,320.9	5,809.9
Total fixed income securities — Available for sale
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	5,201.2	5,620.1
Gross Unrealized Gains	63.6	85.3
Gross Unrealized Losses	(33.8)	(40.8)
Fair Market Value	5,231.0	5,664.6
Total short-term investments — Available for sale
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	90.0	145.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Fair Market Value	89.9	145.3
U.S. government
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	1,166.5	1,207.9
Gross Unrealized Gains	4.5	9.4
Gross Unrealized Losses	(11.6)	(11.2)
Fair Market Value	1,159.4	1,206.1
U.S. agency
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	51.8	117.7
Gross Unrealized Gains	0.5	1.9
Gross Unrealized Losses	(0.2)	0.0
Fair Market Value	52.1	119.6
Municipal
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	53.0	23.2
Gross Unrealized Gains	2.1	1.6
Gross Unrealized Losses	(0.2)	(0.4)
Fair Market Value	54.9	24.4
Corporate
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	2,391.4	2,566.9
Gross Unrealized Gains	36.1	39.6
Gross Unrealized Losses	(11.8)	(20.0)
Fair Market Value	2,415.7	2,586.5
Non-U.S. government-backed corporate
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	91.5	89.2
Gross Unrealized Gains	0.3	0.7
Gross Unrealized Losses	(0.5)	(0.1)
Fair Market Value	91.3	89.8
Non-U.S government
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	479.7	477.7
Gross Unrealized Gains	6.4	11.8
Gross Unrealized Losses	(1.2)	(0.8)
Fair Market Value	484.9	488.7
Asset-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	26.3	62.6
Gross Unrealized Gains	0.0	0.4
Gross Unrealized Losses	(0.1)	0.0
Fair Market Value	26.2	63.0
Non-agency commercial mortgage-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	0.0	12.3
Gross Unrealized Gains	0.0	0.3
Gross Unrealized Losses	0.0	0.0
Fair Market Value	0.0	12.6
Agency mortgage-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	941.0	1,062.6
Gross Unrealized Gains	13.7	19.6
Gross Unrealized Losses	(8.2)	(8.3)
Fair Market Value	$ 946.5	$ 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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