XML 66 R49.htm IDEA: XBRL DOCUMENT v3.10.0.1

Summary of Significant Accounting Policies - Schedule Of Amortization Period For Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	11 years 10 months 15 days	11 years 7 months 6 days
Purchased contract rights
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	12 years 7 months 6 days	12 years 7 months 6 days
Purchased contract rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	5 years
Purchased contract rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	15 years
Provider contracts
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	12 years 3 months	11 years 10 months 24 days
Provider contracts | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	4 years
Provider contracts | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	15 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	10 years 10 months 15 days	8 years 2 months 12 days
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	3 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	15 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	15 years 2 months	9 years 7 months 6 days
Trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	7 years
Trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	20 years
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	5 years 2 months	5 years
Developed technologies | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	2 years
Developed technologies | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization period	7 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ContractualRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=cnc_ProviderContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DevelopedTechnologyRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: