Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill by Segment (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill gross		$ 2,711.6	$ 2,730.4
Accumulated impairment losses		(2,278.1)	(2,272.6)
Goodwill		433.5	457.8
Impairment	$ (20.6)	(20.6)
Disposition		(3.9)
Foreign exchange		0.2
Business Services
Goodwill [Line Items]
Goodwill gross		2,192.1	2,210.9
Accumulated impairment losses		(2,024.0)	(2,018.5)
Goodwill		168.1	192.4
Impairment	$ (20.6)	(20.6)
Disposition		(3.9)
Foreign exchange		0.2
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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