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Divestitures - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended
Aug. 18, 2014
Apr. 16, 2014
Dec. 31, 2014
Mar. 31, 2015
Mar. 08, 2012
Advent Financial Services LLC [Member]          
Divestitures Narrative          
Proceeds from Sale of Intangible Assets $ 1.0us-gaap_ProceedsFromSaleOfIntangibleAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_AdventFinancialServicesLlcMember
       
Gain (Loss) on Disposition of Intangible Assets 0.8us-gaap_GainLossOnDispositionOfIntangibleAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_AdventFinancialServicesLlcMember
       
StreetLinks LLC [Member]          
Divestitures Narrative          
Bonus payments to StreetLinks employees   1.0novc_EarnedBonusPaymentstoStreetLinksEmployees
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_StreetlinksLlcMember
     
Gain on sale of subsidiary before taxes     48.2us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_StreetlinksLlcMember
   
Transaction-related costs     1.8novc_DivestitureofBusinessTransactionCosts
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_StreetlinksLlcMember
   
Assurant Services, LLC [Member] | Purchase and Sale Agreement [Member] | StreetLinks LLC [Member]          
Divestitures Narrative          
Cash received at closing, including portion attributable to noncontrolling interests   60.0novc_DivestitureofBusinessCashReceivedatClosing
/ us-gaap_CounterpartyNameAxis
= novc_AssurantServicesLLCMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_PurchaseandSaleAgreementMember
     
Proceeds from sale of subsidiary   53.9us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_CounterpartyNameAxis
= novc_AssurantServicesLLCMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_PurchaseandSaleAgreementMember
     
Proceeds from sale of subsidiary, adjustments for working capital       0.8novc_ProceedsfromDivestitureofBusinessAdjustmentsforWorkingCapital
/ us-gaap_CounterpartyNameAxis
= novc_AssurantServicesLLCMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_PurchaseandSaleAgreementMember
 
Contingent Consideration Receivable [Member] | Assurant Services, LLC [Member] | Purchase and Sale Agreement [Member] | StreetLinks LLC [Member]          
Divestitures Narrative          
Post-closing consideration, maximum   12.0novc_DivestitureofBusinessPostClosingConsideration
/ us-gaap_CounterpartyNameAxis
= novc_AssurantServicesLLCMember
/ us-gaap_GainContingenciesByNatureAxis
= novc_ContingentConsiderationReceivableMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_PurchaseandSaleAgreementMember
     
Minimum [Member] | 2015 [Member] | Contingent Consideration Receivable [Member] | Purchase and Sale Agreement [Member]          
Divestitures Narrative          
Post-closing consideration, total revenue requirement   184.0novc_DivestitureofBusinessPostClosingConsiderationTotalRevenueRequirement
/ novc_CalendarYearAxis
= novc_A2015Member
/ us-gaap_GainContingenciesByNatureAxis
= novc_ContingentConsiderationReceivableMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_PurchaseandSaleAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Minimum [Member] | 2016 [Member] | Contingent Consideration Receivable [Member] | Purchase and Sale Agreement [Member]          
Divestitures Narrative          
Post-closing consideration, total revenue requirement   167.5novc_DivestitureofBusinessPostClosingConsiderationTotalRevenueRequirement
/ novc_CalendarYearAxis
= novc_A2016Member
/ us-gaap_GainContingenciesByNatureAxis
= novc_ContingentConsiderationReceivableMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_PurchaseandSaleAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Potential Bonus Payments to StreetLinks Employees [Member]          
Divestitures Narrative          
Potential reduction of proceeds, maximum   2.0us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= novc_PotentialBonusPaymentstoStreetLinksEmployeesMember
     
StreetLinks LLC [Member]          
Divestitures Narrative          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Increase in Ownership Percentage         5.00%novc_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIncreaseInOwnershipPercentage
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Transfer of Interest by Parent, Decrease in Ownership Percentage   3.00%novc_ConsolidationLessthanWhollyOwnedSubsidiaryParentOwnershipInterestChangesTransferofInterestbyParentDecreaseinOwnershipPercentage
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
     
Ownership percentage   88.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
     
StreetLinks LLC [Member] | Unit Purchase Agreement [Member]          
Divestitures Narrative          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent, Shares         1,927novc_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentShares
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_UnitPurchaseAgreementMember
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent         6.1us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_UnitPurchaseAgreementMember
Membership units transferred   1,218novc_ConsolidationLessthanWhollyOwnedSubsidiaryParentOwnershipInterestChangesTransferofInterestbyParentShares
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_UnitPurchaseAgreementMember
     
Remaining obligation   3.9us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_UnitPurchaseAgreementMember
     
Future interest owed   $ 0.2novc_NotesPayableRelatedPartiesFutureInterestPayments
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_UnitPurchaseAgreementMember