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Income Taxes - Reconciliation of Income Taxes at Federal Statutory Income Tax Rate (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation Of Income Taxes [Line Items]      
Income tax expense computed at federal statutory income tax rate $ 137.2us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 108.7us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 47.3us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Other income taxes, net of federal tax benefit 7.2us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 7.0us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 3.0us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign taxes at a different rate than U.S. federal statutory income tax rate (13.4)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (10.1)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (7.1)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Tax effect on foreign dividends     12.4us-gaap_IncomeTaxReconciliationDeductionsDividends
Tax benefit on income attributable to domestic production activities (7.6)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (5.2)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (2.1)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Net adjustments for uncertain tax positions 4.7us-gaap_IncomeTaxReconciliationTaxContingencies 3.0us-gaap_IncomeTaxReconciliationTaxContingencies (11.1)us-gaap_IncomeTaxReconciliationTaxContingencies
Net effect of rate changes on deferred taxes (0.7)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate (1.6)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate (0.3)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Prior period items     (3.2)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Valuation allowance (decrease) increase (4.1)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 2.1us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (8.9)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Miscellaneous other, net (5.0)us-gaap_IncomeTaxReconciliationOtherAdjustments (2.4)us-gaap_IncomeTaxReconciliationOtherAdjustments (3.1)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense as reported $ 118.3us-gaap_IncomeTaxExpenseBenefit $ 101.5us-gaap_IncomeTaxExpenseBenefit $ 26.9us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate 30.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 19.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations