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Income Taxes (Details 6) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Change to gross unrecognized tax benefits including interest and penalties $ (9.8)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease $ (20.7)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease $ (10.4)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Reserve released due to favorable audit 8.3mtw_EffectiveTaxRateReserveReleasedDueToFavorableAudit 9.4mtw_EffectiveTaxRateReserveReleasedDueToFavorableAudit 11.6mtw_EffectiveTaxRateReserveReleasedDueToFavorableAudit
Uncertain tax liabilities interest and penalties (5.2)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense (9.3)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense (1.4)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Uncertain tax liabilities interest and penalties accrued 5.6us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 12.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Unrecognized tax benefits and income tax expense possibly reduced from audit resolutions 3.7mtw_UnrecognizedTaxBenefitsDecreaseResultingFromSettlementsWithTaxingAuthoritiesDuringNextTwelveMonths    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year 35.9us-gaap_UnrecognizedTaxBenefits 47.3us-gaap_UnrecognizedTaxBenefits 56.3us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year 15.5us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2.0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 1.8us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions for tax positions of prior years 0.1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 3.7us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 3.6us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions for tax positions of prior years (2.7)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (8.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (11.9)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Reductions based on settlements with taxing authorities (7.3)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (3.6)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (1.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Reductions for lapse of statute (8.2)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (5.4)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (1.4)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance at end of year $ 33.3us-gaap_UnrecognizedTaxBenefits $ 35.9us-gaap_UnrecognizedTaxBenefits $ 47.3us-gaap_UnrecognizedTaxBenefits