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Business Combinations - Intangible Assets Acquired (Details) - USD ($) $ in Millions		9 Months Ended
	Jul. 01, 2019	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets
Weighted Average Useful Life (in years)		13 years
Customer relationships
Acquired Finite-Lived Intangible Assets
Weighted Average Useful Life (in years)		13 years
AXC
Acquired Finite-Lived Intangible Assets
Weighted Average Useful Life (in years)	11 years
Estimated Asset Fair Value	$ 201.4
Indefinite-lived intangible assets:
Trademarks and trade names	55.0
Total identifiable intangible assets acquired	$ 256.4		$ 256.4	$ 256.4
AXC | Customer relationships
Acquired Finite-Lived Intangible Assets
Weighted Average Useful Life (in years)	14 years
Estimated Asset Fair Value	$ 139.1
AXC | Unpatented technology
Acquired Finite-Lived Intangible Assets
Weighted Average Useful Life (in years)	10 years
Estimated Asset Fair Value	$ 42.1
AXC | Backlog
Acquired Finite-Lived Intangible Assets
Weighted Average Useful Life (in years)	1 year
Estimated Asset Fair Value	$ 19.2
AXC | Other identifiable intangible assets
Acquired Finite-Lived Intangible Assets
Weighted Average Useful Life (in years)	4 years
Estimated Asset Fair Value	$ 1.0

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of 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 assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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