Restructuring, Impairment and Other Charges - Schedule of Net Restructuring, Impairment and Other Charges (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost And Reserve [Line Items]
Employee Terminations	$ 2.4	$ 6.1	$ 8.8	$ 11.0
Other Restructuring Charges	1.1	0.8	2.7	2.3
Total Restructuring Charges	3.5	6.9	11.5	13.3
Impairment	(0.3)	0.7	0.2	(0.9)
Other Charges	0.6	0.6	1.2	1.1
Total	3.8	8.2	12.9	13.5
Strategic Services
Restructuring Cost And Reserve [Line Items]
Impairment	(0.3)		0.2
Total Operating Segments | Variable Print
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.6	0.2	1.0	0.4
Other Restructuring Charges	0.2	0.4	0.3	1.2
Total Restructuring Charges	0.8	0.6	1.3	1.6
Impairment	(0.3)	0.4	(0.3)	0.3
Other Charges	0.5	0.5	1.0	0.9
Total	1.0	1.5	2.0	2.8
Total Operating Segments | Strategic Services
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.1	0.2	1.1	0.5
Other Restructuring Charges	(0.1)		0.3
Total Restructuring Charges		0.2	1.4	0.5
Impairment			0.5
Other Charges	0.1	0.1	0.2	0.2
Total	0.1	0.3	2.1	0.7
Total Operating Segments | International
Restructuring Cost And Reserve [Line Items]
Employee Terminations	1.0	2.3	4.5	6.5
Other Restructuring Charges	0.9	0.6	1.9	1.1
Total Restructuring Charges	1.9	2.9	6.4	7.6
Impairment		0.3		(2.5)
Total	1.9	3.2	6.4	5.1
Corporate
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.7	3.4	2.2	3.6
Other Restructuring Charges	0.1	(0.2)	0.2
Total Restructuring Charges	0.8	3.2	2.4	3.6
Impairment				1.3
Total	$ 0.8	$ 3.2	$ 2.4	$ 4.9