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Components of Change in Projected Benefit Obligation and Change in Plan Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Change in projected benefit obligation:      
Benefit obligation, beginning balance $ 1,961.6us-gaap_DefinedBenefitPlanBenefitObligation $ 2,068.0us-gaap_DefinedBenefitPlanBenefitObligation  
Service cost 67.3us-gaap_DefinedBenefitPlanServiceCost 73.5us-gaap_DefinedBenefitPlanServiceCost 64.1us-gaap_DefinedBenefitPlanServiceCost
Interest cost 91.8us-gaap_DefinedBenefitPlanInterestCost 81.0us-gaap_DefinedBenefitPlanInterestCost 81.4us-gaap_DefinedBenefitPlanInterestCost
Benefits paid (72.5)us-gaap_DefinedBenefitPlanBenefitsPaid (68.4)us-gaap_DefinedBenefitPlanBenefitsPaid  
Actuarial loss (gain) 412.8us-gaap_DefinedBenefitPlanActuarialGainLoss (199.2)us-gaap_DefinedBenefitPlanActuarialGainLoss  
Currency translation and other (47.6)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation 3.2us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation  
Participant contributions 4.0us-gaap_DefinedBenefitPlanContributionsByPlanParticipants 3.5us-gaap_DefinedBenefitPlanContributionsByPlanParticipants  
Projected benefit obligation, ending balance 2,417.4us-gaap_DefinedBenefitPlanBenefitObligation 1,961.6us-gaap_DefinedBenefitPlanBenefitObligation 2,068.0us-gaap_DefinedBenefitPlanBenefitObligation
Change in plan assets:      
Fair value of plan assets, beginning balance 2,108.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 1,901.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
Employer contributions 81.1us-gaap_DefinedBenefitPlanContributionsByEmployer 26.2us-gaap_DefinedBenefitPlanContributionsByEmployer  
Actual return on plan assets 235.8us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 242.5us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets  
Benefits paid (72.5)us-gaap_DefinedBenefitPlanBenefitsPaid (68.4)us-gaap_DefinedBenefitPlanBenefitsPaid  
Currency translation and other (47.4)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets 3.6us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets  
Participant contributions 4.0us-gaap_DefinedBenefitPlanContributionsByPlanParticipants 3.5us-gaap_DefinedBenefitPlanContributionsByPlanParticipants  
Fair value of plan assets, ending balance 2,309.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 2,108.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 1,901.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Funded status, ending balance (108.0)us-gaap_DefinedBenefitPlanFundedStatusOfPlan 146.8us-gaap_DefinedBenefitPlanFundedStatusOfPlan  
Amounts recorded on balance sheet      
Other noncurrent assets 15.0us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent 217.7us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent  
Other liabilities 123.0us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent 70.9us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent  
Accumulated other comprehensive (loss) income:      
Actuarial loss 428.9us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax 257.0us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax  
Prior service cost 3.9us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax 4.9us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax  
Net initial transition amount $ 0.3us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsBeforeTax $ 0.3us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsBeforeTax