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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, 2017	Dec. 31, 2016
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 5,781.3	$ 5,765.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	82.3	85.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(35.7)	(40.8)
Available-for-sale Securities	5,827.9	5,809.9
U.S. government
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,267.1	1,207.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	9.3	9.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(9.3)	(11.2)
Available-for-sale Securities	1,267.1	1,206.1
U.S. agency
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	106.1	117.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1.3	1.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0.0	0.0
Available-for-sale Securities	107.4	119.6
Municipal
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	22.9	23.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1.7	1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(0.2)	(0.4)
Available-for-sale Securities	24.4	24.4
Corporate
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,564.5	2,566.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	40.0	39.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(16.8)	(20.0)
Available-for-sale Securities	2,587.7	2,586.5
Non-U.S. government-backed corporate
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	84.0	89.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0.6	0.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(0.1)	(0.1)
Available-for-sale Securities	84.5	89.8
Non-U.S. government
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	483.2	477.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	11.4	11.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(0.4)	(0.8)
Available-for-sale Securities	494.2	488.7
Asset-backed
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	54.5	62.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0.3	0.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0.0	0.0
Available-for-sale Securities	54.8	63.0
Non-agency commercial mortgage-backed
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	11.3	12.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0.2	0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0.0	0.0
Available-for-sale Securities	11.5	12.6
Agency mortgage-backed
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,024.2	1,062.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	17.5	19.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(8.9)	(8.3)
Available-for-sale Securities	1,032.8	1,073.9
Total fixed income securities — Available for sale
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	5,617.8	5,620.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	82.3	85.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(35.7)	(40.8)
Available-for-sale Securities	5,664.4	5,664.6
Total short-term investments — Available for sale
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	163.5	145.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0.0	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0.0	0.0
Available-for-sale Securities	$ 163.5	$ 145.3

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)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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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

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-Publisher FASB
-Name Accounting Standards Codification
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