Goodwill and Other Intangible Assets - Schedule of Changes in the Carrying Value of Goodwill by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill gross		$ 4,803.5	$ 4,768.3	$ 4,803.5	$ 4,607.9
Accumulated impairment losses		(3,096.9)	(3,024.7)	(3,096.9)	(3,171.6)
Goodwill		1,706.6	1,743.6	1,706.6	1,436.3
Acquisitions			66.3	300.1
Foreign exchange and other adjustments			(11.3)	(11.7)
Impairment charges			(18.0)	(18.1)
Publishing and Retail Services
Goodwill [Line Items]
Goodwill gross		688.0	739.2	688.0	688.0
Accumulated impairment losses		(688.0)	(688.0)	(688.0)	(669.9)
Goodwill		0.0	51.2	0.0	18.1
Acquisitions			51.2	0.0
Foreign exchange and other adjustments			0.0	0.0
Impairment charges		(18.1)	0.0	(18.1)
Variable Print
Goodwill [Line Items]
Goodwill gross		1,914.1	1,914.0	1,914.1	1,638.6
Accumulated impairment losses		(1,105.2)	(1,105.2)	(1,105.2)	(1,105.2)
Goodwill		808.9	808.8	808.9	533.4
Acquisitions			2.3	276.2
Foreign exchange and other adjustments			(2.4)	(0.7)
Impairment charges			0.0	0.0
Strategic Services
Goodwill [Line Items]
Goodwill gross		987.5	991.5	987.5	1,005.4
Accumulated impairment losses		(222.4)	(219.7)	(222.4)	(243.5)
Goodwill		765.1	771.8	765.1	761.9
Acquisitions			7.5	3.4
Foreign exchange and other adjustments			(0.8)	(0.2)
Impairment charges			0.0	0.0
International
Goodwill [Line Items]
Goodwill gross		1,213.9	1,123.6	1,213.9	1,275.9
Accumulated impairment losses		(1,081.3)	(1,011.8)	(1,081.3)	(1,153.0)
Goodwill		$ 132.6	111.8	132.6	$ 122.9
Acquisitions			5.3	20.5
Foreign exchange and other adjustments			(8.1)	(10.8)
Impairment charges	$ (18.0)		$ (18.0)	$ 0.0