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Intangible Assets and Goodwill - Schedule of Changes in Carrying Amount of Goodwill for Each Reportable Segment (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Goodwill [Line Items]
Goodwill, balance	$ 573.8
Acquired goodwill	28.0
Goodwill, balance	601.8
Connections [Member]
Goodwill [Line Items]
Goodwill, balance	538.2
Acquired goodwill	28.0
Goodwill, balance	566.2
All Other [Member]
Goodwill [Line Items]
Goodwill, balance	35.6
Goodwill, balance	$ 35.6

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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