Goodwill and Other Intangible Assets - Schedule of Changes in the Carrying Value of Goodwill by Segment (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill gross	$ 3,279.6	$ 3,279.6	$ 3,206.1
Accumulated impairment losses	(2,692.0)	(2,692.0)	(2,604.1)
Goodwill	587.6	587.6	602.0
Foreign exchange and other adjustments		6.9
Impairment charges		(21.3)
Variable Print
Goodwill [Line Items]
Goodwill gross	1,824.1	1,824.1	1,823.0
Accumulated impairment losses	(1,551.6)	(1,551.6)	(1,550.5)
Goodwill	272.5	272.5	272.5
Strategic Services
Goodwill [Line Items]
Goodwill gross	365.2	365.2	365.2
Accumulated impairment losses	(170.0)	(170.0)	(148.7)
Goodwill	195.2	195.2	216.5
Impairment charges	(21.3)	(21.3)
International
Goodwill [Line Items]
Goodwill gross	1,090.3	1,090.3	1,017.9
Accumulated impairment losses	(970.4)	(970.4)	(904.9)
Goodwill	$ 119.9	119.9	$ 113.0
Foreign exchange and other adjustments		$ 6.9