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	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Foreign currency cumulative translation adjustments, Before Tax	$ (241.5)	$ (44.4)	$ 46.1
Unrealized cash flow hedge gains, Before Tax	60.5	63.6	15.2
Reclassification adjustments on foreign currency hedges, Before Tax	(33.3)	(7.8)	12.2
Reclassification adjustments on securities, Before Tax	(0.4)
Unrealized gains/(losses) on securities, Before Tax	(0.5)	0.1	0.4
Adjustments to prior service cost and unrecognized actuarial assumptions, Before Tax	(104.8)	50.3	20.3
Total Other Comprehensive Gain/(Loss), Before Tax	(320.0)	61.8	94.2
Foreign currency cumulative translation adjustments, Tax	0	0	0
Unrealized cash flow hedge gains, Tax	4.6	30.2	4.3
Reclassification adjustments on foreign currency hedges, Tax	(14.4)	(3.4)	8.9
Reclassification adjustments on securities, Tax	0	0	0
Unrealized gains/(losses) on securities, Tax	0	0	0
Adjustments to prior service cost and unrecognized actuarial assumptions, Tax	(29.0)	11.8	8.5
Total Other Comprehensive Gain/(Loss), Tax	(38.8)us-gaap_OtherComprehensiveIncomeLossTax	38.6us-gaap_OtherComprehensiveIncomeLossTax	21.7us-gaap_OtherComprehensiveIncomeLossTax
Foreign currency cumulative translation adjustments, net of tax	(241.5)	(44.4)	46.1
Unrealized cash flow hedge gains, net of tax	55.9	33.4	10.9
Reclassification adjustments on foreign currency hedges, net of tax	(18.9)	(4.4)	3.3
Reclassification adjustments on securities, net of tax	(0.4)
Unrealized gains/(losses) on securities, net of tax	(0.5)	0.1	0.4
Adjustments to prior service cost and unrecognized actuarial assumptions, net of tax	(75.8)	38.5	11.8
Total Other Comprehensive Gain/(Loss), net of tax	$ (281.2)	$ 23.2	$ 72.5

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

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Statement of Comprehensive Income [Abstract]

Foreign currency cumulative translation adjustments, Before Tax

$ (241.5)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

$ (44.4)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

$ 46.1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

Unrealized cash flow hedge gains, Before Tax

60.5us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

63.6us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

15.2us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

Reclassification adjustments on foreign currency hedges, Before Tax

(33.3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax

(7.8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax

12.2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax

Reclassification adjustments on securities, Before Tax

(0.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

Unrealized gains/(losses) on securities, Before Tax

(0.5)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

0.1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

0.4us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

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

(104.8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax

50.3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax

20.3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax

Total Other Comprehensive Gain/(Loss), Before Tax

(320.0)us-gaap_OtherComprehensiveIncomeLossBeforeTax

61.8us-gaap_OtherComprehensiveIncomeLossBeforeTax

94.2us-gaap_OtherComprehensiveIncomeLossBeforeTax

Foreign currency cumulative translation adjustments, Tax

0us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax

Unrealized cash flow hedge gains, Tax

4.6us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

30.2us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

4.3us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

Reclassification adjustments on foreign currency hedges, Tax

(14.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax

(3.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax

8.9us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax

Reclassification adjustments on securities, Tax

0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

Unrealized gains/(losses) on securities, Tax

0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

Adjustments to prior service cost and unrecognized actuarial assumptions, Tax

(29.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax

11.8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax

8.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax

Total Other Comprehensive Gain/(Loss), Tax

(38.8)us-gaap_OtherComprehensiveIncomeLossTax

38.6us-gaap_OtherComprehensiveIncomeLossTax

21.7us-gaap_OtherComprehensiveIncomeLossTax

Foreign currency cumulative translation adjustments, net of tax

(241.5)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

(44.4)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

46.1us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

Unrealized cash flow hedge gains, net of tax

55.9us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

33.4us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

10.9us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

Reclassification adjustments on foreign currency hedges, net of tax

(18.9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

(4.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

3.3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

Reclassification adjustments on securities, net of tax

(0.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax

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

(0.5)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

0.1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

0.4us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

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

(75.8)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

38.5us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

11.8us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

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

$ (281.2)us-gaap_OtherComprehensiveIncomeLossNetOfTax

$ 23.2us-gaap_OtherComprehensiveIncomeLossNetOfTax

$ 72.5us-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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