Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill by Segment (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill gross	$ 3,117.7	$ 3,123.8
Accumulated impairment losses	(2,562.8)	(2,570.4)
Goodwill	554.9	553.4
Acquisition	4.1
Foreign exchange	(2.6)
Business Services
Goodwill [Line Items]
Goodwill gross	2,598.2	2,604.3
Accumulated impairment losses	(2,308.7)	(2,316.3)
Goodwill	289.5	288.0
Acquisition	4.1
Foreign exchange	(2.6)
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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