Debt and Other Financing Arrangements - Credit Agreement - Narrative (Details)	3 Months Ended
Mar. 31, 2022 USD ($)
Term B-1 Loans [Member]
Line Of Credit Facility [Line Items]
Debt instrument updated maturity date	2028-11
Term B-2 Loans [Member]
Line Of Credit Facility [Line Items]
Debt instrument expiration date	2028-11
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Borrowings under the revolving credit facility	$ 0
Line of credit facility, remaining borrowing capacity	$ 400,000,000.0
Debt instrument expiration date	2026-09

Debt instrument maturity month and year.

No definition available.

Name:	ck716133_DebtInstrumentMaturityMonthAndYear
Namespace Prefix:	ck716133_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument updated maturity month and year.

+ References

No definition available.

+ Details

Name:	ck716133_DebtInstrumentUpdatedMaturityMonthAndYear
Namespace Prefix:	ck716133_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=ck716133_TermBOneLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ck716133_TermB2LoanMember
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: