CONDENSED CONSOLIDATED STATEMENTS OF EQUITY AND NONCONTROLLING INTEREST (Unaudited) (Parenthetical)	Mar. 31, 2023 shares
Statement of Stockholders' Equity [Abstract]
Shares repurchased not yet settled	60,000

Stock Repurchased During Period, Shares, Not Yet Settled

No definition available.

Name:	gpk_StockRepurchasedDuringPeriodSharesNotYetSettled
Namespace Prefix:	gpk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant