World Color Press Insolvency Proceedings (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016	Dec. 31, 2014	Jul. 02, 2010
Bankruptcy Claims [Line Items]
Amounts owing in satisfaction of bankruptcy claims	$ 2.3	$ 1.4
Restricted cash paid to Class 3 Claim creditors	0.3	0.1
Refunds of restricted cash	4.0	17.5
Unsecured notes to be issued	5.4	7.1		$ 9.0
Class 4 Claims [Member]
Bankruptcy Claims [Line Items]
Amounts owing in satisfaction of bankruptcy claims			$ 1.1
Class 3 Claims Unsecured Note Recovery [Member]
Bankruptcy Claims [Line Items]
Bankruptcy claims, percentage of unsecured note of allowed class 3 claim					50.00%
Bankruptcy claims, amount of unsecured note threshold					$ 75.0
Bankruptcy claims, prepayment redemption premium					5.00%
Amounts owing in satisfaction of bankruptcy claims [Member] | Priority Cash Recovery [Member]
Bankruptcy Claims [Line Items]
Amounts owing in satisfaction of bankruptcy claims	1.2	$ 1.4
Restricted cash [Member]
Bankruptcy Claims [Line Items]
Bankruptcy claims, maximum potential payout	7.2
Unsecured notes to be issued [Member]
Bankruptcy Claims [Line Items]
Unsecured notes to be issued	$ 5.4
Defeasance of Unsecured Notes to be Issued [Member]
Bankruptcy Claims [Line Items]
Bankruptcy claims, maximum potential payout					$ 89.2