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, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill gross	$ 2,730.4	$ 3,123.8	$ 3,279.3
Accumulated impairment losses	(2,272.6)	(2,570.4)	(2,690.8)
Goodwill	457.8	553.4	588.5
Acquisition	4.1
Disposition		(32.4)
Foreign exchange and other adjustments	(1.2)	(2.7)
Impairment charges	(98.5)
Business Services
Goodwill [Line Items]
Goodwill gross	2,210.9	2,604.3	2,759.8
Accumulated impairment losses	(2,018.5)	(2,316.3)	(2,436.7)
Goodwill	192.4	288.0	323.1
Acquisition	4.1
Disposition		(32.4)
Foreign exchange and other adjustments	(1.2)	(2.7)
Impairment charges	(98.5)
Marketing Solutions
Goodwill [Line Items]
Goodwill gross	519.5	519.5	519.5
Accumulated impairment losses	(254.1)	(254.1)	(254.1)
Goodwill	$ 265.4	$ 265.4	265.4
Impairment charges			$ (21.3)

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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