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INVESTMENTS - Schedule of Investments in Continuous Loss Position (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	$ 56.1	$ 182.1
Gross unrealized losses, less than twelve months	(0.2)	(1.1)
Fair value, twelve months or greater	299.5	321.5
Gross unrealized losses, twelve months or greater	(2.0)	(4.4)
Fair value, total	355.6	503.6
Gross unrealized losses, total	(2.2)	(5.5)
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	0.0	0.7
Gross unrealized losses, less than twelve months	0.0	(0.1)
Fair value, twelve months or greater	56.7	56.5
Gross unrealized losses, twelve months or greater	(0.4)	(0.6)
Fair value, total	56.7	57.2
Gross unrealized losses, total	(0.4)	(0.7)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	0.0	4.0
Gross unrealized losses, less than twelve months	0.0	0.1
Fair value, twelve months or greater	53.7	61.3
Gross unrealized losses, twelve months or greater	(0.3)	(0.6)
Fair value, total	53.7	65.3
Gross unrealized losses, total	(0.3)	(0.5)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	56.1	177.4
Gross unrealized losses, less than twelve months	(0.2)	(1.1)
Fair value, twelve months or greater	189.1	203.7
Gross unrealized losses, twelve months or greater	(1.3)	(3.2)
Fair value, total	245.2	381.1
Gross unrealized losses, total	$ (1.5)	$ (4.3)

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

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+ References

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