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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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Goodwill and Intangible Assets - Narratives (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020
Finite-lived and Indefinite-lived Intangible Assets
Intangible assets amortization expense		$ 45.7	$ 39.8	$ 21.9
AXC
Finite-lived and Indefinite-lived Intangible Assets
Intangible assets amortization expense			16.8
AXC \| Trademarks and trade names
Finite-lived and Indefinite-lived Intangible Assets
Impairment of intangible asset		16.0
Indefinite lived intangible asset		$ 39.0	$ 55.0		$ 55.0
Minimum
Finite-lived and Indefinite-lived Intangible Assets
Finite lived intangible asset useful life		2 years
Minimum \| AXC
Finite-lived and Indefinite-lived Intangible Assets
Finite lived intangible asset useful life	1 year
Maximum
Finite-lived and Indefinite-lived Intangible Assets
Finite lived intangible asset useful life		15 years
Maximum \| AXC
Finite-lived and Indefinite-lived Intangible Assets
Finite lived intangible asset useful life	14 years
Government grants \| Minimum
Finite-lived and Indefinite-lived Intangible Assets
Finite lived intangible asset useful life		10 years
Government grants \| Maximum
Finite-lived and Indefinite-lived Intangible Assets
Finite lived intangible asset useful life		50 years