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, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill gross	$ 3,279.3	$ 3,206.1	$ 3,236.4
Accumulated impairment losses	(2,690.8)	(2,604.1)	(2,150.7)
Goodwill	588.5	602.0	1,085.7
Acquisitions		42.5
Foreign exchange and other adjustments	7.8	1.6
Impairment charges	(21.3)	(527.8)
Variable Print
Goodwill [Line Items]
Goodwill gross	1,823.9	1,823.0	1,794.5
Accumulated impairment losses	(1,551.4)	(1,550.5)	(1,022.9)
Goodwill	272.5	272.5	771.6
Acquisitions		21.2
Foreign exchange and other adjustments		7.5
Impairment charges		(527.8)
Strategic Services
Goodwill [Line Items]
Goodwill gross	365.2	365.2	343.9
Accumulated impairment losses	(170.0)	(148.7)	(148.7)
Goodwill	195.2	216.5	195.2
Acquisitions		21.3
Impairment charges	(21.3)
International
Goodwill [Line Items]
Goodwill gross	1,090.2	1,017.9	1,098.0
Accumulated impairment losses	(969.4)	(904.9)	(979.1)
Goodwill	120.8	113.0	$ 118.9
Foreign exchange and other adjustments	$ 7.8	$ (5.9)