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Pensions and other postretirement benefit plans - Narrative (Details) $ in Millions	9 Months Ended	24 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)
Gannett Retirement Plan
Defined Benefit Plan Disclosure
Defined benefit plan required funding status (as a percent)	100.00%	100.00%
Expected future employer contributions, quarterly certification funding requirement		$ 1.0
Defined benefit plan, expected future employee contributions, quarterly certification funding requirement term (in days)		60 days
Expected future employer contributions, quarterly certification funding requirement (maximum)		$ 5.0
Current funding status (as a percent)	100.00%	100.00%
Pension benefits
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans	$ 7.8
Postretirement benefits
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans	$ 3.7

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