Restructuring and Other - Schedule of Net Restructuring and Other Expenses (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost And Reserve [Line Items]
Employee Terminations	$ 8.1	$ 3.2
Other Restructuring Charges	8.2	1.4
Multi-Employer Pension Plan Charges	0.7	0.8
Other	0.1	(4.6)
Total	17.1	0.8
Total Operating Segments | Business Services
Restructuring Cost And Reserve [Line Items]
Employee Terminations	7.8	1.8
Other Restructuring Charges	4.7	0.8
Multi-Employer Pension Plan Charges	0.6	0.7
Other	0.1	(4.9)
Total	13.2	(1.6)
Total Operating Segments | Marketing Solutions
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.1	1.1
Other Restructuring Charges	0.0
Multi-Employer Pension Plan Charges	0.1	0.1
Other	0.0	0.3
Total	0.2	1.5
Corporate
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.2	0.3
Other Restructuring Charges	3.5	0.6
Multi-Employer Pension Plan Charges	0.0
Other	0.0
Total	$ 3.7	$ 0.9