Net proceeds from sale-leaseback transaction after transaction cost.

No definition available.

Name:	ck716133_NetProceedsFromSaleLeasebackTransactionAfterTransactionCost
Namespace Prefix:	ck716133_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Operating lease right of use liability.

+ References

No definition available.

+ Details

Name:	ck716133_OperatingLeaseRightOfUseLiability
Namespace Prefix:	ck716133_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sale leaseback transaction sale price.

+ References

No definition available.

+ Details

Name:	ck716133_SaleLeasebackTransactionSalePrice
Namespace Prefix:	ck716133_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of gain (loss) on sale or disposal of assets utilized in financial service operations.

+ References

No definition available.

+ Details

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

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

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=ck716133_LeasebackAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Leases - Narratives (Details) - USD ($) $ in Millions	Aug. 31, 2021	Sep. 30, 2021	Sep. 01, 2021	Dec. 31, 2020
Lessee Lease Description [Line Items]
Sale leaseback transaction sale price	$ 9.1
Net proceeds from sale-leaseback transaction after transaction cost	6.6
Gain on sale of assets	$ 2.8
Operating lease right-of-use assets		$ 41.4		$ 37.4
Leaseback Agreement
Lessee Lease Description [Line Items]
Operating lease right-of-use assets			$ 7.7
Operating lease right of use liability			$ 7.7