Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Other Intangible Assets [Line Items]
Goodwill impairment non-cash charges		$ 21.3	$ 527.8
Impairment of intangible assets				$ 11.9
Additions to other intangible assets			14.1
Amortization expense for other intangible assets		28.6	33.7	46.2
Client Relationships
Schedule Of Other Intangible Assets [Line Items]
Impairment of intangible assets				$ 11.9
Variable Print
Schedule Of Other Intangible Assets [Line Items]
Goodwill impairment non-cash charges			527.8
Digital And Creative Solutions Reporting Unit
Schedule Of Other Intangible Assets [Line Items]
Goodwill impairment non-cash charges		21.3
Commercial and Digital Print | Variable Print
Schedule Of Other Intangible Assets [Line Items]
Goodwill impairment non-cash charges	$ 416.2		416.2
Impairment of intangible assets		0.2
Commercial and Digital Print | Variable Print | Trade Name
Schedule Of Other Intangible Assets [Line Items]
Impairment of intangible assets		$ 0.2
Commercial and Digital Print | Variable Print | Client Relationships
Schedule Of Other Intangible Assets [Line Items]
Impairment of intangible assets			29.7
Statement Printing | Variable Print
Schedule Of Other Intangible Assets [Line Items]
Goodwill impairment non-cash charges	$ 111.6		$ 111.6