Financial Instruments and Fair Value Measurement - Pretax Derivative Accumulated Other Comprehensive Loss (Details) $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($)
Cumulative Changes in Derivative Net Gain (Loss) [Roll Forward]
Beginning balance	$ 2,058.0
Ending balance	1,833.9
Graphic Packaging Holding Company, Derivative Instruments
Cumulative Changes in Derivative Net Gain (Loss) [Roll Forward]
Beginning balance	(10.9)
Reclassification to Earnings	(2.6)
Current Period Change in Fair Value	11.3
Ending balance	$ (2.2)

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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+ Details