Discontinued Operations - Schedule of Financial Results of Discontinued Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Losses on extinguishment of debt in conjunction with spinoff transactions	$ 10.8	$ 96.1		$ 77.1
Donnelley Financial Solutions And L S C Communications | Discontinued Operations Spinoff
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Spinoff transaction costs		81.2	$ 13.6
Losses on extinguishment of debt in conjunction with spinoff transactions		96.1
Donnelley Financial Solutions And L S C Communications | Discontinued Operations Spinoff | Corporate Level Debt
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Losses on extinguishment of debt in conjunction with spinoff transactions		96.1
Interest expense		$ 55.9	$ 73.3	$ 73.3