Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes An estimated annual effective tax rate is used to determine the quarterly provision for income taxes. The effective rate is based on various factors including expected annual income, statutory tax rates, tax planning strategies in the various jurisdictions in which the Company operates, permanent items, valuation allowances against deferred tax assets and the ability to utilize tax credits and net operating loss carryforwards. Subsequent recognition, derecognition and measurement of uncertain tax positions are separately recognized in the quarter in which the underlying transaction or event occurs which causes variability in the effective tax rates from quarter to quarter. The effective rate for each period differs from the U.S. federal statutory income tax rate due to the mix of earnings by jurisdiction and the effect of transaction costs and business combination accounting adjustments that do not provide tax benefits. The valuation allowances also cause volatility in the effective rate as they reduce deferred tax assets in jurisdictions which lack sufficient positive evidence regarding the ability to utilize the assets and no tax benefit or expense is recognized for losses or income incurred in those jurisdictions. At December 31, 2017, the Company had estimated U.S. net operating loss carryforwards totaling $136.5 million, which are scheduled to expire beginning in 2029. As of December 31, 2017, the Company had determined that it has experienced multiple ownership changes under Internal Revenue Code Section 382 in prior years. During the three months ended June 30, 2018, the Company completed a formal study and determined that the usage of the Company's U.S. net operating losses are limited due to ownership changes that occurred during 2015 and 2017. The Company does not expect the annual limitation to increase U.S. cash taxes or income tax expense. In accordance with ASC 740, the Company records interest and penalties associated with uncertain tax positions within income tax expense in the Company's Condensed Consolidated Statements of Operations. The Company does not have a material liability recorded for interest and penalties related to uncertain tax positions for any period presented. Tax Cuts and Jobs Act On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the "Tax Act") was signed into law and institutes fundamental changes to the taxation of multinational corporations. The Tax Act reduces the corporate tax rate to 21%, repeals the alternative minimum tax ("AMT"), limits the interest deduction, enhances the expensing of capital investments, implements a dividend exemption system, eliminates the deferral of foreign earnings, provides a minimum tax on low-taxed foreign earnings and new measures to deter base erosion. As part of the transition to the new tax system, the Tax Act imposes a one-time transition tax on historical undistributed earnings of foreign affiliates through the year ended December 31, 2017. Milacron has applied the guidance in Staff Accounting Bulletin 118 when accounting for the enactment-date effects of the Tax Act. As of June 30, 2018, the Company has not completed its accounting for all effects of the Tax Act as further described below. During the three and six months ended June 30, 2018, the Company made no adjustments to the provisional amounts recorded as of December 31, 2017. The Company will continue to refine its calculations as additional analysis is completed and as the Company gains a more thorough understanding of the tax law. These changes could be material to income tax expense. As a result of the Tax Act, the Company projects U.S. taxable income for 2018. The projected taxable income has no impact on the effective tax rate as the expense of utilizing the U.S. net operating loss carryforwards is offset by the benefit of reversing the associated valuation allowances. Corporate Tax Rate Change - For the year ended December 31, 2017, the Company recorded an income tax benefit of $4.6 million due to the decrease in the corporate tax rate from 35% to 21%. The income tax benefit resulted from reducing net deferred tax liabilities to the new lower rate. There was no impact on the Consolidated Financial Statements as a result of revaluing the Company’s U.S. deferred tax assets as the income tax expense was offset by an income tax benefit for revaluing the associated valuation allowances. During the three and six months ended June 30, 2018, the Company made no adjustments to the provisional amounts recorded as of December 31, 2017 and the Company expects to be complete upon the filing of the Company's 2017 U.S. income tax return. Elimination of Alternative Minimum Tax - For the year ended December 31, 2017, the Company recorded an income tax benefit of $6.7 million due to the elimination of the AMT and the Company reversed valuation allowances recorded against its AMT credit carryovers. Under the Tax Act, the AMT credit carryovers will be refunded between 2019 and 2022. During the three and six months ended June 30, 2018, the Company made no adjustments to the provisional amounts recorded as of December 31, 2017 and the Company expects to be complete upon the filing of the Company's 2017 U.S. income tax return. Mandatory Transition Tax - For the year ended December 31, 2017, the Company recorded a provisional transition tax of $6.5 million. The Company expects to utilize existing U.S. net operating loss carryforwards in lieu of paying the transition tax over the next eight years. The one-time transition tax is based on the Company’s total post-1986 earnings and profits (E&P) which the Company had deferred from U.S. income taxes under previous U.S. tax law. The Company will continue to refine its calculations but no adjustments to the provisional amounts recorded at December 31, 2017 were made during the three and six months ended June 30, 2018. The Company expects to be complete upon the filing of the Company's 2017 U.S. income tax return. Global Intangible Low-Taxed Income ("GILTI") - The GILTI provisions of the Tax Act also require the Company to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. The Company expects that it will have incremental U.S. taxable income as a result of the GILTI provisions beginning in 2018. The FASB states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. Given the complexity of the GILTI provisions, the Company is still evaluating the effects of the GILTI provisions and has not yet determined its accounting policy. As of June 30, 2018, the Company computed an estimate of GILTI income for 2018; however, the estimate did not impact the Company’s effective tax rate as discussed above. Interest Limitation - The Tax Act limits net interest expense to 30% of adjusted taxable income. At June 30, 2018, the Company expects its interest expense deduction to be limited; however, the limitation did not impact the Company’s expected effective tax rate as a result of the Company's full valuation allowance position in the U.S. Undistributed Foreign Earnings - As of June 30, 2018, the Company asserts that all foreign earnings will be indefinitely reinvested with the exception of certain foreign investments in which earnings and cash generation are in excess of local needs. With the passage of the Tax Act, the Company's deferral of recognition of its previously earned foreign earnings ceased. Deferred tax liabilities recorded represent withholding taxes on accumulated foreign earnings for which the Company does not intend to permanently reinvest. The Company will continue to monitor its assertion related to investment of foreign earnings.

Income Taxes

An estimated annual effective tax rate is used to determine the quarterly provision for income taxes. The effective rate is based on various factors including expected annual income, statutory tax rates, tax planning strategies in the various jurisdictions in which the Company operates, permanent items, valuation allowances against deferred tax assets and the ability to utilize tax credits and net operating loss carryforwards. Subsequent recognition, derecognition and measurement of uncertain tax positions are separately recognized in the quarter in which the underlying transaction or event occurs which causes variability in the effective tax rates from quarter to quarter.

The effective rate for each period differs from the U.S. federal statutory income tax rate due to the mix of earnings by jurisdiction and the effect of transaction costs and business combination accounting adjustments that do not provide tax benefits. The valuation allowances also cause volatility in the effective rate as they reduce deferred tax assets in jurisdictions which lack sufficient positive evidence regarding the ability to utilize the assets and no tax benefit or expense is recognized for losses or income incurred in those jurisdictions.

At December 31, 2017, the Company had estimated U.S. net operating loss carryforwards totaling $136.5 million, which are scheduled to expire beginning in 2029. As of December 31, 2017, the Company had determined that it has experienced multiple ownership changes under Internal Revenue Code Section 382 in prior years. During the three months ended June 30, 2018, the Company completed a formal study and determined that the usage of the Company's U.S. net operating losses are limited due to ownership changes that occurred during 2015 and 2017. The Company does not expect the annual limitation to increase U.S. cash taxes or income tax expense.

In accordance with ASC 740, the Company records interest and penalties associated with uncertain tax positions within income tax expense in the Company's Condensed Consolidated Statements of Operations. The Company does not have a material liability recorded for interest and penalties related to uncertain tax positions for any period presented.

Tax Cuts and Jobs Act

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the "Tax Act") was signed into law and institutes fundamental changes to the taxation of multinational corporations. The Tax Act reduces the corporate tax rate to 21%, repeals the alternative minimum tax ("AMT"), limits the interest deduction, enhances the expensing of capital investments, implements a dividend exemption system, eliminates the deferral of foreign earnings, provides a minimum tax on low-taxed foreign earnings and new measures to deter base erosion. As part of the transition to the new tax system, the Tax Act imposes a one-time transition tax on historical undistributed earnings of foreign affiliates through the year ended December 31, 2017. Milacron has applied the guidance in Staff Accounting Bulletin 118 when accounting for the enactment-date effects of the Tax Act. As of June 30, 2018, the Company has not completed its accounting for all effects of the Tax Act as further described below. During the three and six months ended June 30, 2018, the Company made no adjustments to the provisional amounts recorded as of December 31, 2017. The Company will continue to refine its calculations as additional analysis is completed and as the Company gains a more thorough understanding of the tax law. These changes could be material to income tax expense. As a result of the Tax Act, the Company projects U.S. taxable income for 2018. The projected taxable income has no impact on the effective tax rate as the expense of utilizing the U.S. net operating loss carryforwards is offset by the benefit of reversing the associated valuation allowances.

Corporate Tax Rate Change - For the year ended December 31, 2017, the Company recorded an income tax benefit of $4.6 million due to the decrease in the corporate tax rate from 35% to 21%. The income tax benefit resulted from reducing net deferred tax liabilities to the new lower rate. There was no impact on the Consolidated Financial Statements as a result of revaluing the Company’s U.S. deferred tax assets as the income tax expense was offset by an income tax benefit for revaluing the associated valuation allowances. During the three and six months ended June 30, 2018, the Company made no adjustments to the provisional amounts recorded as of December 31, 2017 and the Company expects to be complete upon the filing of the Company's 2017 U.S. income tax return.

Elimination of Alternative Minimum Tax - For the year ended December 31, 2017, the Company recorded an income tax benefit of $6.7 million due to the elimination of the AMT and the Company reversed valuation allowances recorded against its AMT credit carryovers. Under the Tax Act, the AMT credit carryovers will be refunded between 2019 and 2022. During the three and six months ended June 30, 2018, the Company made no adjustments to the provisional amounts recorded as of December 31, 2017 and the Company expects to be complete upon the filing of the Company's 2017 U.S. income tax return.

Mandatory Transition Tax - For the year ended December 31, 2017, the Company recorded a provisional transition tax of $6.5 million. The Company expects to utilize existing U.S. net operating loss carryforwards in lieu of paying the transition tax over the next eight years. The one-time transition tax is based on the Company’s total post-1986 earnings and profits (E&P) which the Company had deferred from U.S. income taxes under previous U.S. tax law. The Company will continue to refine its calculations but no adjustments to the provisional amounts recorded at December 31, 2017 were made during the three and six months ended June 30, 2018. The Company expects to be complete upon the filing of the Company's 2017 U.S. income tax return.

Global Intangible Low-Taxed Income ("GILTI") - The GILTI provisions of the Tax Act also require the Company to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. The Company expects that it will have incremental U.S. taxable income as a result of the GILTI provisions beginning in 2018. The FASB states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. Given the complexity of the GILTI provisions, the Company is still evaluating the effects of the GILTI provisions and has not yet determined its accounting policy. As of June 30, 2018, the Company computed an estimate of GILTI income for 2018; however, the estimate did not impact the Company’s effective tax rate as discussed above.

Interest Limitation - The Tax Act limits net interest expense to 30% of adjusted taxable income. At June 30, 2018, the Company expects its interest expense deduction to be limited; however, the limitation did not impact the Company’s expected effective tax rate as a result of the Company's full valuation allowance position in the U.S.

Undistributed Foreign Earnings - As of June 30, 2018, the Company asserts that all foreign earnings will be indefinitely reinvested with the exception of certain foreign investments in which earnings and cash generation are in excess of local needs. With the passage of the Tax Act, the Company's deferral of recognition of its previously earned foreign earnings ceased. Deferred tax liabilities recorded represent withholding taxes on accumulated foreign earnings for which the Company does not intend to permanently reinvest. The Company will continue to monitor its assertion related to investment of foreign earnings.