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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	Jun. 30, 2017	Dec. 31, 2016
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 5,479.8	$ 5,765.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	84.8	85.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(25.4)	(40.8)
Available-for-sale Securities	5,539.2	5,809.9
Total fixed income securities — Available for sale
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	5,437.9	5,620.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	84.8	85.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(25.4)	(40.8)
Available-for-sale Securities	5,497.3	5,664.6
Total short-term investments — Available for sale
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	41.9	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	41.9	145.3
U.S. government
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,218.3	1,207.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	9.2	9.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(6.7)	(11.2)
Available-for-sale Securities	1,220.8	1,206.1
U.S. agency
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	74.4	117.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1.1	1.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0.0	0.0
Available-for-sale Securities	75.5	119.6
Municipal
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	30.8	23.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2.0	1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0.0	(0.4)
Available-for-sale Securities	32.8	24.4
Corporate
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,469.3	2,566.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	44.7	39.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(10.6)	(20.0)
Available-for-sale Securities	2,503.4	2,586.5
Non-U.S. government-backed corporate
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	92.3	89.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0.5	0.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(0.2)	(0.1)
Available-for-sale Securities	92.6	89.8
Non-U.S. government
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	516.9	477.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	9.7	11.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(0.7)	(0.8)
Available-for-sale Securities	525.9	488.7
Asset-backed
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	48.7	62.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0.2	0.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0.0	0.0
Available-for-sale Securities	48.9	63.0
Non-agency commercial mortgage-backed
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	4.3	12.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0.0	0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0.0	0.0
Available-for-sale Securities	4.3	12.6
Agency mortgage-backed
Statement [Line Items]
Available-for-sale Securities, Amortized Cost Basis	982.9	1,062.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	17.4	19.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(7.2)	(8.3)
Available-for-sale Securities	$ 993.1	$ 1,073.9

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- 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
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+ References

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