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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosures [Line Items]      
Provision (benefit) for taxes on income $ (1.2)us-gaap_IncomeTaxExpenseBenefit $ 2.6us-gaap_IncomeTaxExpenseBenefit  
Federal income tax at statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Unrecognized Tax Benefits 33.7us-gaap_UnrecognizedTaxBenefits   33.3us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities During Next Twelve Months $ 3.7mtw_UnrecognizedTaxBenefitsDecreaseResultingFromSettlementsWithTaxingAuthoritiesDuringNextTwelveMonths