Restructuring and Other - Schedule of Net Restructuring and Other (Income) Expenses (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]
Employee Terminations	$ 0.6	$ 2.8	$ 19.5	$ 11.2
Other Restructuring Charges	1.0	6.4	13.7	11.5
Multi-Employer Pension Plan Charges	0.8	0.7	2.2	2.2
Other	(4.7)	1.1	(4.6)	(2.1)
Total	(2.3)	11.0	30.8	22.8
Total Operating Segments | Business Services
Restructuring Cost And Reserve [Line Items]
Employee Terminations	(0.4)	2.7	17.6	8.8
Other Restructuring Charges	(0.7)	3.4	7.0	5.2
Multi-Employer Pension Plan Charges	0.7	0.6	1.9	1.9
Other	(4.7)	0.4	(4.6)	(4.3)
Total	(5.1)	7.1	21.9	11.6
Total Operating Segments | Marketing Solutions
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.0	0.1	0.4	1.9
Other Restructuring Charges	0.0		0.1
Multi-Employer Pension Plan Charges	0.1	0.1	0.3	0.3
Other	0.0		0.0	1.5
Total	0.1	0.2	0.8	3.7
Corporate
Restructuring Cost And Reserve [Line Items]
Employee Terminations	1.0		1.5	0.5
Other Restructuring Charges	1.7	3.0	6.6	6.3
Multi-Employer Pension Plan Charges	0.0		0.0
Other	0.0	0.7	0.0	0.7
Total	$ 2.7	$ 3.7	$ 8.1	$ 7.5