Intangibles Assets, Net (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total annual intangible asset amortization expense
Intangible assets (net of accumulated amortization)	$ 1,688.0	$ 1,883.0
Amortization expense	180.0	180.0	$ 187.0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2022	175.0
2023	168.0
2024	162.0
2025	160.0
2026	157.0
Thereafter	866.0
Rexam
Total annual intangible asset amortization expense
Amortization expense	152.0	150.0	$ 155.0
Customer-Related Intangible Assets [Member]
Total annual intangible asset amortization expense
Intangible assets (net of accumulated amortization)	1,593.0	1,785.0
Accumulated amortization	862.0	729.0
Computer Software, Intangible Asset [Member]
Total annual intangible asset amortization expense
Intangible assets (net of accumulated amortization)	74.0	69.0
Accumulated amortization	187.0	196.0
Other Intangible Assets [Member]
Total annual intangible asset amortization expense
Intangible assets (net of accumulated amortization)	21.0	29.0
Accumulated amortization	$ 97.0	$ 124.0

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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