Goodwill and Other Intangible Assets - Schedule of Changes in the Carrying Value of Goodwill by Segment (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill gross	$ 3,151.2	$ 3,279.3
Accumulated impairment losses	(2,596.9)	(2,690.8)
Goodwill	554.3	588.5
Disposition	(32.4)
Foreign exchange	(1.8)
Business Services
Goodwill [Line Items]
Goodwill gross	2,631.7	2,759.8
Accumulated impairment losses	(2,342.8)	(2,436.7)
Goodwill	288.9	323.1
Disposition	(32.4)
Foreign exchange	(1.8)
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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