Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill by Segment (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill gross	$ 2,699.5	$ 2,730.4
Accumulated impairment losses	(2,267.0)	(2,272.6)
Goodwill	432.5	457.8
Impairment	(20.6)
Disposition	(3.9)
Foreign exchange	(0.8)
Business Services
Goodwill [Line Items]
Goodwill gross	2,180.0	2,210.9
Accumulated impairment losses	(2,012.9)	(2,018.5)
Goodwill	167.1	192.4
Impairment	(20.6)
Disposition	(3.9)
Foreign exchange	(0.8)
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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