Cash outflow for payment interest accrued on debt instrument.

No definition available.

Name:	amch_AccruedInterestPaid
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of interest rate in cash.

+ References

No definition available.

+ Details

Name:	amch_DebtInstrumentInterestRatePaymentInCash
Namespace Prefix:	amch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed in the next fiscal year following current fiscal year in which the debt is borrowed.

+ References

No definition available.

+ Details

Name:	amch_DebtInstrumentInterestRatePercentageInYearOne
Namespace Prefix:	amch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed after the first fiscal year following current fiscal year in which the debt is borrowed.

+ References

No definition available.

+ Details

Name:	amch_DebtInstrumentInterestRatePercentageThereafter
Namespace Prefix:	amch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of paid in kind interest rate.

+ References

No definition available.

+ Details

Name:	amch_DebtInstrumentPaidInKindInterestRatePercentage
Namespace Prefix:	amch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt and finance lease obligations. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper and including finance lease obligations.

+ References

No definition available.

+ Details

Name:	amch_LongTermDebtAndFinanceLeaseObligations
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Noncurrent portion of amount, after unamortized (discount) premium and debt issuance costs, of long-term debt and finance lease obligations. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper and including finance lease obligations.

+ References

No definition available.

+ Details

Name:	amch_LongTermDebtAndFinanceLeaseObligationsNoncurrent
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the threshold minimum percentage of voting stock.

+ References

No definition available.

+ Details

Name:	amch_ThresholdMinimumPercentageOfVotingStock
Namespace Prefix:	amch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

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=124435984&loc=d3e28551-108399

Reference 3: 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

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

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

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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

- Definition

Amount, after accumulated amortization, of debt discount (premium).

+ References

Reference 1: 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=124435984&loc=d3e28555-108399

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=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28567-108399

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 6: 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_DebtInstrumentUnamortizedDiscountPremiumNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 3: 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=124435984&loc=d3e28555-108399

+ Details

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

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSubordinatedNotes6.375PercentDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSubordinatedNotes5.75PercentDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSubordinatedNotes5.875PercentDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSubordinatedNotes6.125PercentDue2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=amch_SeniorSecuredCreditFacilityTermLoanDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=amch_OdeonTermLoanFacilityDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=amch_FirstLienNotesDue2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=amch_DebtRedemptionAtTimeOfSaleOfAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=amch_FirstLienNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=amch_FirstLienNotesDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=amch_FirstLienToggleNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=amch_SecondLienSubordinatedSecuredNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=amch_SecondLienNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS - Long-term debt and lease obligations (Details) € in Millions, £ in Millions, $ in Millions		3 Months Ended		6 Months Ended	12 Months Ended	18 Months Ended
	Feb. 14, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 EUR (€)	Jun. 30, 2022 GBP (£)	Dec. 20, 2021 USD ($)
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		$ 5,115.5		$ 5,115.5	$ 5,169.1	$ 5,115.5
Finance lease obligations		61.9		61.9	72.7	61.9
Deferred financing costs		35.5		35.5	39.1	35.5
Net premium		298.2		298.2	298.0	298.2
Total long-term debt and finance lease obligations		5,440.1		5,440.1	5,500.7	5,440.1
Current maturities corporate borrowings		(20.0)		(20.0)	(20.0)	(20.0)
Current maturities of finance lease liabilities		(6.6)		(6.6)	(9.5)	(6.6)
Noncurrent portion of long-term debt and finance lease obligations		5,413.5		5,413.5	5,471.2	5,413.5
Principal and premium repayments		57.9	$ 955.7
Gain (loss) on debt extinguishment		38.6		(96.4)
Debt Instrument, Redemption Price as Percentage of Principal Amount	107.50%
6.375% Senior Subordinated Notes due 2024
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		4.8		4.8	5.4	4.8
Net premium		$ 0.1		$ 0.1	$ 0.1	$ 0.1
Stated interest rate (as a percent)		6.375%		6.375%	6.375%	6.375%		6.375%	6.375%
Debt instrument face amount \| £									£ 4.0
5.75 % Senior Subordinated Notes due 2025
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		$ 98.3		$ 98.3	$ 98.3	$ 98.3
Stated interest rate (as a percent)		5.75%		5.75%	5.75%	5.75%		5.75%	5.75%
5.875% Senior Subordinated Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		$ 55.6		$ 55.6	$ 55.6	$ 55.6
Stated interest rate (as a percent)		5.875%		5.875%	5.875%	5.875%		5.875%	5.875%
6.125% Senior Subordinated Notes due 2027
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		$ 130.7		$ 130.7	$ 130.7	$ 130.7
Stated interest rate (as a percent)		6.125%		6.125%	6.125%	6.125%		6.125%	6.125%
Senior Secured Credit Facility
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Debt instrument face amount							$ 100.0			$ 100.0
Senior Secured Credit Facility Term-Loan Due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		$ 1,935.0		$ 1,935.0	$ 1,945.0	$ 1,935.0
Net premium		$ (5.5)		$ (5.5)	(6.1)	$ (5.5)
Stated interest rate (as a percent)		4.199%		4.199%		4.199%		4.199%	4.199%
Odeon Term Loan due 2023
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		$ 505.6		$ 505.6	552.6	$ 505.6		€ 312.2	£ 147.6
Net premium		$ (7.8)		$ (7.8)	$ (12.1)	$ (7.8)
Stated interest rate (as a percent)		11.25%		11.25%		11.25%		11.25%	11.25%
Interest rate percentage in year one		10.75%		10.75%		10.75%		10.75%	10.75%
Interest rate percentage in year thereafter		11.25%		11.25%		11.25%		11.25%	11.25%
Debt instrument face amount								€ 312.2	£ 147.6
First Lien Notes due 2029
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		$ 950.0		$ 950.0		$ 950.0
Stated interest rate (as a percent)	7.50%	7.50%		7.50%	7.50%	7.50%		7.50%	7.50%
Gain (loss) on debt extinguishment		$ 0.0		$ 135.0
Debt instrument face amount	$ 950.0
Debt Instrument, Redemption Price as Percentage of Principal Amount	101.00%
Threshold Minimum Percentage of Voting Stock	65.00%
First Lien Notes due 2029 \| Redemption at any time on or after February 15,2025
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Debt instrument redemption amount as a percentage of principal amount	103.75%
First Lien Notes due 2029 \| Redemption at any on or after February 15, 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Debt instrument redemption amount as a percentage of principal amount	101.875%
First Lien Notes due 2029 \| On or after June February 15, 2027
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Debt instrument redemption amount as a percentage of principal amount	100.00%
First Lien Notes due 2029 \| At the time of sale of assets
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Debt Instrument, Redemption Price as Percentage of Principal Amount	35.00%
Debt instrument redemption amount as a percentage of principal amount	100.00%
First Lien Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings					$ 300.0
Net premium					$ (24.5)
Stated interest rate (as a percent)	10.50%	10.50%		10.50%	10.50%	10.50%		10.50%	10.50%
Principal and premium repayments	$ 300.0
First Lien Notes due 2025
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings					$ 500.0
Net premium					$ (7.2)
Stated interest rate (as a percent)	10.50%	10.50%		10.50%	10.50%	10.50%		10.50%	10.50%
Principal and premium repayments	$ 500.0
First Lien Toggle Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Interest rate cash (as a percent)	15.00%			15.00%	15.00%
PIK interest rate (as a percent)	17.00%			17.00%	17.00%
Principal and premium repayments	$ 73.5
First Lien Toggle Notes due 2026 \| Debt Agreement with Mudrick Capital Management, LP [Member]
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings					$ 73.5
Net premium					(16.8)
Second Lien Subordinated Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Carrying value of corporate borrowings		$ 1,435.5		$ 1,435.5	1,508.0	$ 1,435.5
Net premium		311.4		$ 311.4	$ 364.6	$ 311.4
Interest rate cash (as a percent)				10.00%	10.00%	10.00%
PIK interest rate (as a percent)				12.00%	12.00%
Second Lien Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Gain (loss) on debt extinguishment		38.6
Debt instrument face amount		72.5		$ 72.5		$ 72.5
Repurchase amount		50.0		$ 50.0		$ 50.0
Accrued interest		$ 3.1