Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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 unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ 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 lease obligation, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of long-term debt and lease obligation, including portion classified as current.

+ 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_DomesticLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=esi_EURIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=esi_FirstLienCreditFacilityEuroTermLoanDueTwoThousandTwentyOneInterestAtGreaterOfThreePointFivePercentorEURIBORPlusTwoPointSevenFivePercentMember
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_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Debt - Schedule of Debt (Details) - USD ($)		12 Months Ended
Debt - Schedule of Debt (Details) - USD ($)	Nov. 26, 2019	Dec. 31, 2019	Jan. 31, 2019	Dec. 31, 2018
Debt Instrument
Total debt and finance lease obligations		$ 1,521,000,000.0		$ 5,376,000,000.0
Less: current installments of long-term debt and revolving credit facilities		7,800,000		25,300,000
Total long-term debt and finance lease obligations		1,513,200,000		5,350,700,000
Domestic Line of Credit
Debt Instrument
Unamortized premiums, discounts and debt issuance costs		$ 9,100,000		$ 22,400,000
Effective interest rate percentage		2.20%		4.60%
Domestic Line of Credit \| USD Term Loan
Debt Instrument
Debt face amount			$ 750,000,000
Spread on variable rate (percent)	0.25%
Total debt and finance lease obligations		$ 733,400,000		$ 0
Domestic Line of Credit \| USD Term Loan \| LIBOR
Debt Instrument
Spread on variable rate (percent)		2.00%
Domestic Line of Credit \| First Lien Credit Facility - USD Term Loans Due 2020, Interest Rate Greater of 3.50% or LIBOR plus 2.50%
Debt Instrument
Stated interest rate		3.50%
Total debt and finance lease obligations		$ 0		624,300,000
Domestic Line of Credit \| First Lien Credit Facility - USD Term Loans Due 2020, Interest Rate Greater of 3.50% or LIBOR plus 2.50% \| LIBOR
Debt Instrument
Spread on variable rate (percent)		2.50%
Domestic Line of Credit \| First Lien Credit Facility - USD Term Loans Due 2021, Interest Rate Greater of 4.00% or LIBOR plus 3.00%
Debt Instrument
Stated interest rate		4.00%
Total debt and finance lease obligations		$ 0		1,124,700,000
Domestic Line of Credit \| First Lien Credit Facility - USD Term Loans Due 2021, Interest Rate Greater of 4.00% or LIBOR plus 3.00% \| LIBOR
Debt Instrument
Spread on variable rate (percent)		3.00%
Senior Notes
Debt Instrument
Unamortized premiums, discounts and debt issuance costs		$ 13,300,000		$ 29,900,000
Effective interest rate percentage		6.20%		6.50%
Senior Notes \| USD Senior Notes Due 2025
Debt Instrument
Debt face amount		$ 800,000,000
Stated interest rate		5.875%
Total debt and finance lease obligations		$ 786,700,000		$ 784,900,000
Senior Notes \| USD Senior Notes Due 2022
Debt Instrument
Debt face amount		$ 1,100,000,000
Stated interest rate		6.50%
Total debt and finance lease obligations				1,067,100,000
Senior Notes \| EUR Senior Notes Due 2023
Debt Instrument
Debt face amount		$ 350,000,000
Stated interest rate		6.00%
Total debt and finance lease obligations		$ 0		397,400,000
Foreign Line of Credit \| First Lien Credit Facility - Euro Term Loans Due 2020, Interest Rate Greater of 3.25% or EURIBOR plus 2.50%
Debt Instrument
Stated interest rate		3.25%
Total debt and finance lease obligations		$ 0		666,200,000
Foreign Line of Credit \| First Lien Credit Facility - Euro Term Loans Due 2020, Interest Rate Greater of 3.25% or EURIBOR plus 2.50% \| EURIBOR
Debt Instrument
Spread on variable rate (percent)		2.50%
Foreign Line of Credit \| First Lien Credit Facility - Euro Term Loans Due 2021, Interest Rate Greater of 3.50% or EURIBOR plus 2.75%
Debt Instrument
Stated interest rate		3.50%
Total debt and finance lease obligations		$ 0		685,300,000
Foreign Line of Credit \| First Lien Credit Facility - Euro Term Loans Due 2021, Interest Rate Greater of 3.50% or EURIBOR plus 2.75% \| EURIBOR
Debt Instrument
Spread on variable rate (percent)		2.75%
Line of Credit \| Revolving Credit Facility
Debt Instrument
Total debt and finance lease obligations		$ 0		25,000,000.0
Line of Credit \| Revolving Credit Facility \| LIBOR
Debt Instrument
Spread on variable rate (percent)		2.25%
Other
Debt Instrument
Total debt and finance lease obligations		$ 900,000		$ 1,100,000