World Color Press Inc. Insolvency Proceedings (Activity Impacting Restricted Cash and Unsecured Notes To Be Issued) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) in Restricted Cash [Roll Forward]
Restricted cash, beginning of period	$ 10.2
Restricted cash, Class 3 Claim payments	8.1	$ 0.0
Restricted cash refunded to Quad/Graphics	(2.2)
Restricted cash, Non-cash adjustments	0.0
Restricted cash, end of period	2.0
Increase (Decrease) in Unsecured Note [Roll Forward]
Unsecured notes to be issued, beginning of period	5.4
Unsecured notes to be issued, restricted cash refunded to Quad/Graphics	0.0
Unsecured notes to be issued, non-cash adjustments	(0.4)
Unsecured notes to be issued, end of period	0.9
Defeasance of Unsecured Notes to be Issued [Member]
Increase (Decrease) in Restricted Cash [Roll Forward]
Restricted cash, beginning of period	7.2
Restricted cash, end of period	0.9
Class 3 Claims Unsecured Note Recovery [Member]
Increase (Decrease) in Restricted Cash [Roll Forward]
Restricted cash, Class 3 Claim payments	(4.1)
Increase (Decrease) in Unsecured Note [Roll Forward]
Unsecured notes to be issued, Class 3 Claim payments	$ (4.1)