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Earnings Contribution of Northern Trust's Reporting Segments (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Trust, Investment and Other Servicing Fees $ 2,832.8ntrs_TrustInvestmentAndOtherServicingFees $ 2,609.8ntrs_TrustInvestmentAndOtherServicingFees $ 2,405.5ntrs_TrustInvestmentAndOtherServicingFees
Foreign Exchange Trading Income 210.1us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 244.4us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 206.1us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other Noninterest Income 282.8us-gaap_NoninterestIncomeOther 302.0us-gaap_NoninterestIncomeOther 294.2us-gaap_NoninterestIncomeOther
Net Interest Income (FTE) 1,034.9ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment [1] 965.6ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment [1] 1,031.1ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment [1]
Revenue (FTE) 4,360.6ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment [1] 4,121.8ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment [1] 3,936.9ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment [1]
Provision for Credit Losses 6.0us-gaap_ProvisionForLoanAndLeaseLosses 20.0us-gaap_ProvisionForLoanAndLeaseLosses 25.0us-gaap_ProvisionForLoanAndLeaseLosses
Noninterest Expense 3,135.0us-gaap_NoninterestExpense 2,993.8us-gaap_NoninterestExpense 2,878.8us-gaap_NoninterestExpense
Income before Income Taxes 1,219.6ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment [1] 1,108.0ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment [1] 1,033.1ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment [1]
Provision (Benefit) for Income Taxes 407.8ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment [1] 376.7ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment [1] 345.8ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment [1]
Net Income 811.8us-gaap_NetIncomeLoss 731.3us-gaap_NetIncomeLoss 687.3us-gaap_NetIncomeLoss
Average Assets 104,083.5ntrs_SegmentReportingInformationConsolidatedAverageAssets 94,857.7ntrs_SegmentReportingInformationConsolidatedAverageAssets 92,975.5ntrs_SegmentReportingInformationConsolidatedAverageAssets
Noninterest Income 3,325.7us-gaap_NoninterestIncome 3,156.2us-gaap_NoninterestIncome 2,905.8us-gaap_NoninterestIncome
Corporate and Institutional Services      
Segment Reporting Information [Line Items]      
Trust, Investment and Other Servicing Fees 1,584.0ntrs_TrustInvestmentAndOtherServicingFees
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 1,443.8ntrs_TrustInvestmentAndOtherServicingFees
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 1,334.1ntrs_TrustInvestmentAndOtherServicingFees
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember
Foreign Exchange Trading Income 200.4us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 238.8us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 193.5us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember
Other Noninterest Income 177.9us-gaap_NoninterestIncomeOther
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 177.3us-gaap_NoninterestIncomeOther
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 193.6us-gaap_NoninterestIncomeOther
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember
Net Interest Income (FTE) 310.0ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2] 275.9ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2] 280.1ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2]
Revenue (FTE) 2,272.3ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2] 2,135.8ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2] 2,001.3ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2]
Provision for Credit Losses 5.8us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 (3.4)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 (2.1)us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember
Noninterest Expense 1,732.8us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 1,657.9us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 1,599.9us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember
Income before Income Taxes 533.7ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2] 481.3ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2] 403.5ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2]
Provision (Benefit) for Income Taxes 149.4ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2] 145.6ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2] 114.3ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 [2]
Net Income 384.3us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 335.7us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 289.2us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember
Percentage of Consolidated Net Income 47.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 46.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 42.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember
Average Assets 59,462.9ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 53,308.2ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember		 49,904.0ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_CorporateAndInstitutionalServiceMember
Wealth Management      
Segment Reporting Information [Line Items]      
Trust, Investment and Other Servicing Fees 1,248.8ntrs_TrustInvestmentAndOtherServicingFees
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 1,166.0ntrs_TrustInvestmentAndOtherServicingFees
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 1,071.4ntrs_TrustInvestmentAndOtherServicingFees
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember
Foreign Exchange Trading Income 9.7us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 5.6us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 12.6us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember
Other Noninterest Income 98.3us-gaap_NoninterestIncomeOther
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 116.7us-gaap_NoninterestIncomeOther
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 93.6us-gaap_NoninterestIncomeOther
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember
Net Interest Income (FTE) 536.1ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2] 557.7ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2] 629.9ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2]
Revenue (FTE) 1,892.9ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2] 1,846.0ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2] 1,807.5ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2]
Provision for Credit Losses 0.2us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 23.4us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 27.1us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember
Noninterest Expense 1,268.7us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 1,215.0us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 1,182.3us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember
Income before Income Taxes 624.0ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2] 607.6ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2] 598.1ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2]
Provision (Benefit) for Income Taxes 234.8ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2] 229.2ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2] 226.4ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 [2]
Net Income 389.2us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 378.4us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 371.7us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember
Percentage of Consolidated Net Income 48.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 52.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 54.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember
Average Assets 23,629.3ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 22,887.6ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember		 23,917.9ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_WealthManagementMember
Treasury and Other      
Segment Reporting Information [Line Items]      
Net Interest Income (FTE) 188.8ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2] 132.0ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2] 121.1ntrs_InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2]
Revenue (FTE) 195.4ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2] 140.0ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2] 128.1ntrs_RevenueIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2]
Noninterest Expense 133.5us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 120.9us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 96.6us-gaap_NoninterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember
Income before Income Taxes 61.9ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2] 19.1ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2] 31.5ntrs_IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2]
Provision (Benefit) for Income Taxes 23.6ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2] 1.9ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2] 5.1ntrs_IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 [2]
Net Income 38.3us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 17.2us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 26.4us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember
Percentage of Consolidated Net Income 5.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 2.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 4.00%ntrs_PercentageOfConsolidatedNetIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember
Average Assets 20,991.3ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 18,661.9ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 19,153.6ntrs_SegmentReportingInformationConsolidatedAverageAssets
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember
Noninterest Income $ 6.6us-gaap_NoninterestIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 $ 8.0us-gaap_NoninterestIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember		 $ 7.0us-gaap_NoninterestIncome
/ us-gaap_StatementBusinessSegmentsAxis
= ntrs_TreasuryAndOtherMember
[1] Stated on an FTE basis. The consolidated figures include $29.4 million, $32.5 million, and $40.8 million, of FTE adjustments for 2014, 2013, and 2012, respectively.
[2] Stated on an FTE basis.