Goodwill and Intangibles, net - Changes in the Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 111.0
Acquisitions	12.1
Translation	(0.3)
Ending balance	122.8
Infrastructure
Goodwill [Roll Forward]
Beginning balance	89.6
Acquisitions	12.1
Translation	(0.3)
Ending balance	101.4
Spectrum
Goodwill [Roll Forward]
Beginning balance	21.4
Acquisitions	0.0
Translation	0.0
Ending balance	$ 21.4

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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