Debt - Schedule of Future Debt Obligation Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Principal payments
2025	$ 68.0
2026	68.0
2027	106.1
2028	68.0
2029 and thereafter	801.7
Total debt obligations	$ 1,111.8

Long-Term Debt, Maturity, Principal Payments Year Five And After Year Five

No definition available.

Name:	gci_LongTermDebtMaturityPrincipalPaymentsYearFiveAndAfterYearFive
Namespace Prefix:	gci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant