Goodwill and Other Intangible Assets - Schedule of Changes in the Carrying Value of Goodwill by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill gross	$ 3,123.8	$ 3,279.3	$ 3,206.1
Accumulated impairment losses	(2,570.4)	(2,690.8)	(2,604.1)
Goodwill	553.4	588.5	602.0
Disposition	(32.4)
Foreign exchange and other adjustments	(2.7)	7.8
Impairment charges		(21.3)
Business Services
Goodwill [Line Items]
Goodwill gross	2,604.3	2,759.8	2,686.6
Accumulated impairment losses	(2,316.3)	(2,436.7)	(2,371.3)
Goodwill	288.0	323.1	315.3
Disposition	(32.4)
Foreign exchange and other adjustments	(2.7)	7.8
Impairment charges			(527.8)
Marketing Solutions
Goodwill [Line Items]
Goodwill gross	519.5	519.5	519.5
Accumulated impairment losses	(254.1)	(254.1)	(232.8)
Goodwill	$ 265.4	265.4	286.7
Impairment charges		$ (21.3)	$ (527.8)

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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