Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Principal, including current portion	$ 955.2	$ 1,035.9
Unamortized Discount and Debt Issuance Costs, including current portion	15.5	22.2
Net, including current portion	939.7	1,013.7
Principal, current portion	(7.8)	(13.2)
Unamortized Discount and Debt Issuance Costs, current portion	0.0	(0.2)
Net, current portion	(7.8)	(13.0)
Principal	947.4	1,022.7
Unamortized Discount and Debt Issuance Costs	15.5	22.0
Net	931.9	1,000.7
Senior notes [Member] \| 8.375% senior secured notes due 2019 [Member]
Debt Instrument [Line Items]
Principal, including current portion	0.0	220.0
Unamortized Discount and Debt Issuance Costs, including current portion	0.0	4.4
Net, including current portion	0.0	215.6
Senior notes [Member] \| 7.75% senior unsecured notes due 2021 [Member]
Debt Instrument [Line Items]
Principal, including current portion	465.0	465.0
Unamortized Discount and Debt Issuance Costs, including current portion	9.1	10.9
Net, including current portion	455.9	454.1
Line of credit [Member] \| Other lines of credit [Member]
Debt Instrument [Line Items]
Principal, including current portion	7.4	9.2
Unamortized Discount and Debt Issuance Costs, including current portion	0.0	0.0
Net, including current portion	7.4	9.2
Line of credit [Member] \| Secured [Member] \| Senior secured term loan facility due March 2020 [Member]
Debt Instrument [Line Items]
Principal, including current portion	0.0	340.0
Unamortized Discount and Debt Issuance Costs, including current portion	0.0	6.9
Net, including current portion	0.0	333.1
Line of credit [Member] \| Secured [Member] \| Senior secured term loan facility due September 2020 [Member]
Debt Instrument [Line Items]
Principal, including current portion	482.0	0.0
Unamortized Discount and Debt Issuance Costs, including current portion	6.4	0.0
Net, including current portion	475.6	0.0
Capital lease obligations and other [Member]
Debt Instrument [Line Items]
Principal, including current portion	0.8	1.7
Unamortized Discount and Debt Issuance Costs, including current portion	0.0	0.0
Net, including current portion	$ 0.8	$ 1.7

Debt Instrument, Unamortized Discount (Premium), And Debt Issuance Costs, Net

No definition available.

Name:	mcrn_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix:	mcrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Unamortized Discount (Premium), And Debt Issuance Costs, Net, Current

+ References

No definition available.

+ Details

Name:	mcrn_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNetCurrent
Namespace Prefix:	mcrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Unamortized Discount (Premium), And Debt Issuance Costs, Net, Noncurrent

+ References

No definition available.

+ Details

Name:	mcrn_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNetNoncurrent
Namespace Prefix:	mcrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Long-term Debt and Capital Lease Obligations, Gross

+ References

No definition available.

+ Details

Name:	mcrn_LongtermDebtandCapitalLeaseObligationsGross
Namespace Prefix:	mcrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long-term Debt and Capital Lease Obligations, Gross, Current

+ References

No definition available.

+ Details

Name:	mcrn_LongtermDebtandCapitalLeaseObligationsGrossCurrent
Namespace Prefix:	mcrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long-term Debt and Capital Lease Obligations, Including Current Maturities, Gross

+ References

No definition available.

+ Details

Name:	mcrn_LongtermDebtandCapitalLeaseObligationsIncludingCurrentMaturitiesGross
Namespace Prefix:	mcrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_DebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section H

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital lease obligations including current maturities.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mcrn_SeniorSecuredNotesDue2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mcrn_SeniorUnsecuredNotesDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mcrn_OtherLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mcrn_SeniorSecuredTermLoanFacilityDueMarch2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mcrn_SeniorSecuredTermLoanFacilityDueSeptember2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=mcrn_CapitalLeaseObligationsandOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: