Accumulated Other Comprehensive Income - Tax Effects on Each Component of Other Comprehensive Income Recognized in Statements of Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Foreign currency cumulative translation adjustments, Before Tax	$ (152.7)	$ 15.9
Unrealized cash flow hedge gains/(losses), Before Tax	51.7	(3.9)
Reclassification adjustments on foreign currency hedges, Before Tax	(28.0)	(4.9)
Unrealized gains/(losses) on securities, Before Tax	0.6	0.1
Reclassification adjustments on securities, Before Tax		(0.4)
Adjustments to prior service cost and unrecognized actuarial assumptions, Before Tax	3.2	(1.9)
Total Other Comprehensive Gain/(Loss), Before Tax	(125.2)	4.9
Foreign currency cumulative translation adjustments, Tax	0	0
Unrealized cash flow hedge gains/(losses), Tax	(0.7)	(0.8)
Reclassification adjustments on foreign currency hedges, Tax	(6.4)	(2.9)
Unrealized gains/(losses) on securities, Tax	0	0
Reclassification adjustments on securities, Tax		0
Adjustments to prior service cost and unrecognized actuarial assumptions, Tax	(0.7)
Total Other Comprehensive Gain/(Loss), Tax	(7.8)us-gaap_OtherComprehensiveIncomeLossTax	(3.7)us-gaap_OtherComprehensiveIncomeLossTax
Foreign currency cumulative translation adjustments, net of tax	(152.7)	15.9
Unrealized cash flow hedge gains/(losses), net of tax	52.4	(3.1)
Reclassification adjustments on foreign currency hedges, net of tax	(21.6)	(2.0)
Unrealized gains/(losses) on securities, net of tax	0.6	0.1
Reclassification adjustments on securities, net of tax		(0.4)
Adjustments to prior service cost and unrecognized actuarial assumptions, net of tax	3.9	(1.9)
Total Other Comprehensive Gain/(Loss), net of tax	$ (117.4)	$ 8.6

Accumulated Other Comprehensive Income - Tax Effects on Each Component of Other Comprehensive Income Recognized in Statements of Comprehensive Income (Detail) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Statement of Comprehensive Income [Abstract]

Foreign currency cumulative translation adjustments, Before Tax

$ (152.7)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

$ 15.9us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

Unrealized cash flow hedge gains/(losses), Before Tax

51.7us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

(3.9)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

Reclassification adjustments on foreign currency hedges, Before Tax

(28.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax

(4.9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax

Unrealized gains/(losses) on securities, Before Tax

0.6us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

0.1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

Reclassification adjustments on securities, Before Tax

(0.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

Adjustments to prior service cost and unrecognized actuarial assumptions, Before Tax

3.2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax

(1.9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax

Total Other Comprehensive Gain/(Loss), Before Tax

(125.2)us-gaap_OtherComprehensiveIncomeLossBeforeTax

4.9us-gaap_OtherComprehensiveIncomeLossBeforeTax

Foreign currency cumulative translation adjustments, Tax

0us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax

Unrealized cash flow hedge gains/(losses), Tax

(0.7)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

(0.8)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

Reclassification adjustments on foreign currency hedges, Tax

(6.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax

(2.9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax

Unrealized gains/(losses) on securities, Tax

0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

Reclassification adjustments on securities, Tax

0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

Adjustments to prior service cost and unrecognized actuarial assumptions, Tax

(0.7)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax

Total Other Comprehensive Gain/(Loss), Tax

(7.8)us-gaap_OtherComprehensiveIncomeLossTax

(3.7)us-gaap_OtherComprehensiveIncomeLossTax

Foreign currency cumulative translation adjustments, net of tax

(152.7)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

15.9us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

Unrealized cash flow hedge gains/(losses), net of tax

52.4us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

(3.1)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

Reclassification adjustments on foreign currency hedges, net of tax

(21.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

(2.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

Unrealized gains/(losses) on securities, net of tax

0.6us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

0.1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

Reclassification adjustments on securities, net of tax

(0.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

Adjustments to prior service cost and unrecognized actuarial assumptions, net of tax

3.9us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

(1.9)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

Total Other Comprehensive Gain/(Loss), net of tax

$ (117.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax

$ 8.6us-gaap_OtherComprehensiveIncomeLossNetOfTax

- Definition

Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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