Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill by Segment (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill gross	$ 2,586.5	$ 2,595.6
Accumulated impairment losses	(2,179.7)	(2,185.0)
Goodwill	406.8	410.6
Foreign exchange	(3.8)
Business Services
Goodwill [Line Items]
Goodwill gross	2,067.0	2,076.1
Accumulated impairment losses	(1,925.6)	(1,930.9)
Goodwill	141.4	145.2
Foreign exchange	(3.8)
Marketing Solutions
Goodwill [Line Items]
Goodwill gross	519.5	519.5
Accumulated impairment losses	(254.1)	(254.1)
Goodwill	$ 265.4	$ 265.4

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.

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