Restructuring and Other - Narrative (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Facility	Sep. 30, 2017 USD ($) Facility	Sep. 30, 2018 USD ($) Facility	Sep. 30, 2017 USD ($) Facility
Restructuring Cost And Reserve [Line Items]
Employee termination costs	$ 2.8	$ 10.7	$ 11.2	$ 19.5
Other restructuring charges	$ 6.6	$ 1.1	12.0	$ 3.8
Facility Closures
Restructuring Cost And Reserve [Line Items]
Impairment of other long lived assets			$ 3.3
Business Services
Restructuring Cost And Reserve [Line Items]
Number of facilities closed | Facility	3		3
Gain on sale of previously impaired assets			$ 5.4
Marketing Solutions
Restructuring Cost And Reserve [Line Items]
Number of facilities closed | Facility		1		1
Impairment of other long lived assets		$ 21.5		$ 21.7
Goodwill impairment charges		$ 21.3		$ 21.3