XML 62 R40.htm IDEA: XBRL DOCUMENT v3.10.0.1

INVESTMENTS - Schedule of Investments in Continuous Loss Position (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	$ 331.8	$ 385.3
Gross unrealized losses, less than twelve months	(2.5)	(1.7)
Fair value, twelve months or greater	183.0	119.5
Gross unrealized losses, twelve months or greater	(3.0)	(1.2)
Fair value, total	514.8	504.8
Gross unrealized losses, total	(5.5)	(2.9)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	7.5	2.4
Gross unrealized losses, less than twelve months	0.0	0.0
Fair value, twelve months or greater	0.0	0.0
Gross unrealized losses, twelve months or greater	0.0	0.0
Fair value, total	7.5	2.4
Gross unrealized losses, total	0.0	0.0
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	122.0	31.5
Gross unrealized losses, less than twelve months	(0.3)	(0.2)
Fair value, twelve months or greater	41.3	37.1
Gross unrealized losses, twelve months or greater	(0.6)	(0.5)
Fair value, total	163.3	68.6
Gross unrealized losses, total	(0.9)	(0.7)
Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	1.7	3.0
Gross unrealized losses, less than twelve months	0.0	0.0
Fair value, twelve months or greater	0.0	0.0
Gross unrealized losses, twelve months or greater	0.0	0.0
Fair value, total	1.7	3.0
Gross unrealized losses, total	0.0	0.0
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	39.0	90.8
Gross unrealized losses, less than twelve months	(0.2)	(0.3)
Fair value, twelve months or greater	43.1	23.2
Gross unrealized losses, twelve months or greater	(0.5)	(0.1)
Fair value, total	82.1	114.0
Gross unrealized losses, total	(0.7)	(0.4)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	158.8	253.3
Gross unrealized losses, less than twelve months	(2.0)	(1.2)
Fair value, twelve months or greater	98.6	59.2
Gross unrealized losses, twelve months or greater	(1.9)	(0.6)
Fair value, total	257.4	312.5
Gross unrealized losses, total	(3.9)	(1.8)
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	2.8	4.3
Gross unrealized losses, less than twelve months	0.0	0.0
Fair value, twelve months or greater	0.0	0.0
Gross unrealized losses, twelve months or greater	0.0	0.0
Fair value, total	2.8	4.3
Gross unrealized losses, total	$ 0.0	$ 0.0

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

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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

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

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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 less 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

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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

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

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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 unrealized loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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 unrealized loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: