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Investments - Aggregate Fair Value and Gross Unrealized Loss by Type of Security (Details) $ in Millions	Mar. 31, 2017 USD ($) Security	Dec. 31, 2016 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 2,330.4	$ 2,518.2
0-12 months, Gross Unrealized Loss	(34.7)	(39.3)
Over 12 months, Fair Market Value	73.3	37.0
Over 12 months, Gross Unrealized Loss	(1.0)	(1.5)
Total, Fair Market Value	2,403.7	2,555.2
Total, Gross Unrealized Loss	$ (35.7)	$ (40.8)
Number of Securities | Security	648	679
Total fixed income securities — Available for sale
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 2,296.3	$ 2,517.1
0-12 months, Gross Unrealized Loss	(34.7)	(39.3)
Over 12 months, Fair Market Value	73.3	37.0
Over 12 months, Gross Unrealized Loss	(1.0)	(1.5)
Total, Fair Market Value	2,369.6	2,554.1
Total, Gross Unrealized Loss	$ (35.7)	$ (40.8)
Number of Securities | Security	635	677
Total short-term investments — Available for sale
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 34.1	$ 1.1
0-12 months, Gross Unrealized Loss	0.0	0.0
Over 12 months, Fair Market Value	0.0	0.0
Over 12 months, Gross Unrealized Loss	0.0	0.0
Total, Fair Market Value	34.1	1.1
Total, Gross Unrealized Loss	$ 0.0	$ 0.0
Number of Securities | Security	13	2
U.S. government
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 683.2	$ 724.4
0-12 months, Gross Unrealized Loss	(9.3)	(11.2)
Over 12 months, Fair Market Value	0.0	0.0
Over 12 months, Gross Unrealized Loss	0.0	0.0
Total, Fair Market Value	683.2	724.4
Total, Gross Unrealized Loss	$ (9.3)	$ (11.2)
Number of Securities | Security	77	78
U.S. agency
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 14.8	$ 14.1
0-12 months, Gross Unrealized Loss	0.0	0.0
Over 12 months, Fair Market Value	0.0	0.0
Over 12 months, Gross Unrealized Loss	0.0	0.0
Total, Fair Market Value	14.8	14.1
Total, Gross Unrealized Loss	$ 0.0	$ 0.0
Number of Securities | Security	6	4
Municipal
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 6.5	$ 7.7
0-12 months, Gross Unrealized Loss	(0.2)	(0.2)
Over 12 months, Fair Market Value	0.0	0.8
Over 12 months, Gross Unrealized Loss	0.0	(0.2)
Total, Fair Market Value	6.5	8.5
Total, Gross Unrealized Loss	$ (0.2)	$ (0.4)
Number of Securities | Security	3	6
Corporate
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 895.0	$ 1,044.4
0-12 months, Gross Unrealized Loss	(16.6)	(19.4)
Over 12 months, Fair Market Value	3.4	6.6
Over 12 months, Gross Unrealized Loss	(0.2)	(0.6)
Total, Fair Market Value	898.4	1,051.0
Total, Gross Unrealized Loss	$ (16.8)	$ (20.0)
Number of Securities | Security	339	386
Non-U.S. government-backed corporate
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 32.0	$ 29.6
0-12 months, Gross Unrealized Loss	(0.1)	(0.1)
Over 12 months, Fair Market Value	0.0	0.0
Over 12 months, Gross Unrealized Loss	0.0	0.0
Total, Fair Market Value	32.0	29.6
Total, Gross Unrealized Loss	$ (0.1)	$ (0.1)
Number of Securities | Security	10	11
Non-U.S. government
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 87.7	$ 143.5
0-12 months, Gross Unrealized Loss	(0.3)	(0.8)
Over 12 months, Fair Market Value	40.7	1.0
Over 12 months, Gross Unrealized Loss	(0.1)	0.0
Total, Fair Market Value	128.4	144.5
Total, Gross Unrealized Loss	$ (0.4)	$ (0.8)
Number of Securities | Security	28	29
Asset-backed
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 23.9	$ 25.8
0-12 months, Gross Unrealized Loss	0.0	0.0
Over 12 months, Fair Market Value	0.7	1.4
Over 12 months, Gross Unrealized Loss	0.0	0.0
Total, Fair Market Value	24.6	27.2
Total, Gross Unrealized Loss	$ 0.0	$ 0.0
Number of Securities | Security	16	15
Agency mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 553.2	$ 527.6
0-12 months, Gross Unrealized Loss	(8.2)	(7.6)
Over 12 months, Fair Market Value	28.5	27.2
Over 12 months, Gross Unrealized Loss	(0.7)	(0.7)
Total, Fair Market Value	581.7	554.8
Total, Gross Unrealized Loss	$ (8.9)	$ (8.3)
Number of Securities | Security	156	148

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