Separate Financial Information of Subsidiary Guarantors of Indebtedness (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 8.9	$ 64.4	$ 10.7	$ 19.2
Receivables, less allowances for doubtful accounts	510.4	552.5
Intercompany receivables	0.0	0.0
Inventories	290.7	246.5
Other current assets	68.1	45.1
Total current assets	878.1	908.5
Property, plant and equipment—net	1,306.8	1,377.6
Investment in consolidated entities	0.0	0.0
Goodwill and intangible assets—net	184.6	43.4
Intercompany loan receivable	0.0	0.0
Other long-term assets	100.4	122.9
Total assets	2,469.9	2,452.4
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	396.1	381.6
Intercompany accounts payable	0.0	0.0
Short-term debt and current portion of long-term debt and capital lease obligations	42.3	47.6
Other current liabilities	272.1	316.7
Total current liabilities	710.5	745.9
Long-term debt and capital lease obligations	1,005.5	917.2
Intercompany loan payable	0.0	0.0
Other long-term liabilities	250.6	266.9
Total liabilities	1,966.6	1,930.0
Total shareholders' equity and noncontrolling interests	503.3	522.4
Total liabilities and shareholders' equity	2,469.9	2,452.4
Eliminations
ASSETS
Cash and cash equivalents	0.0	0.0	0.0	0.0
Receivables, less allowances for doubtful accounts	0.0	0.0
Intercompany receivables	(72.4)	(85.3)
Inventories	0.0	0.0
Other current assets	0.0	0.0
Total current assets	(72.4)	(85.3)
Property, plant and equipment—net	0.0	0.0
Investment in consolidated entities	(771.2)	(590.4)
Goodwill and intangible assets—net	0.0	0.0
Intercompany loan receivable	(107.6)	(108.0)
Other long-term assets	0.0	0.0
Total assets	(951.2)	(783.7)
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	0.0	0.0
Intercompany accounts payable	(72.4)	(85.3)
Short-term debt and current portion of long-term debt and capital lease obligations	0.0	0.0
Other current liabilities	0.0	0.0
Total current liabilities	(72.4)	(85.3)
Long-term debt and capital lease obligations	0.0	0.0
Intercompany loan payable	(107.6)	(108.0)
Other long-term liabilities	0.0	0.0
Total liabilities	(180.0)	(193.3)
Total shareholders' equity and noncontrolling interests	(771.2)	(590.4)
Total liabilities and shareholders' equity	(951.2)	(783.7)
Quad/Graphics, Inc.
ASSETS
Cash and cash equivalents	1.7	51.7	0.7	0.3
Receivables, less allowances for doubtful accounts	353.9	427.9
Intercompany receivables	0.0	0.0
Inventories	112.6	97.0
Other current assets	43.7	35.2
Total current assets	511.9	611.8
Property, plant and equipment—net	684.0	706.5
Investment in consolidated entities	756.2	578.3
Goodwill and intangible assets—net	4.3	6.9
Intercompany loan receivable	107.6	106.3
Other long-term assets	41.8	60.5
Total assets	2,105.8	2,070.3
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	213.1	201.6
Intercompany accounts payable	72.4	75.1
Short-term debt and current portion of long-term debt and capital lease obligations	30.0	31.9
Other current liabilities	161.8	213.9
Total current liabilities	477.3	522.5
Long-term debt and capital lease obligations	994.5	904.3
Intercompany loan payable	0.0	0.0
Other long-term liabilities	130.7	121.1
Total liabilities	1,602.5	1,547.9
Total shareholders' equity and noncontrolling interests	503.3	522.4
Total liabilities and shareholders' equity	2,105.8	2,070.3
Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	0.7	2.0	5.0	12.1
Receivables, less allowances for doubtful accounts	70.5	40.6
Intercompany receivables	67.6	85.3
Inventories	137.2	108.6
Other current assets	14.7	2.6
Total current assets	290.7	239.1
Property, plant and equipment—net	468.4	508.6
Investment in consolidated entities	15.0	12.1
Goodwill and intangible assets—net	123.5	25.5
Intercompany loan receivable	0.0	0.0
Other long-term assets	10.4	13.5
Total assets	908.0	798.8
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	114.9	115.9
Intercompany accounts payable	0.0	0.0
Short-term debt and current portion of long-term debt and capital lease obligations	0.9	1.0
Other current liabilities	75.0	74.9
Total current liabilities	190.8	191.8
Long-term debt and capital lease obligations	2.1	1.4
Intercompany loan payable	41.4	40.9
Other long-term liabilities	109.0	133.4
Total liabilities	343.3	367.5
Total shareholders' equity and noncontrolling interests	564.7	431.3
Total liabilities and shareholders' equity	908.0	798.8
Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	6.5	10.7	$ 5.0	$ 6.8
Receivables, less allowances for doubtful accounts	86.0	84.0
Intercompany receivables	4.8	0.0
Inventories	40.9	40.9
Other current assets	9.7	7.3
Total current assets	147.9	142.9
Property, plant and equipment—net	154.4	162.5
Investment in consolidated entities	0.0	0.0
Goodwill and intangible assets—net	56.8	11.0
Intercompany loan receivable	0.0	1.7
Other long-term assets	48.2	48.9
Total assets	407.3	367.0
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	68.1	64.1
Intercompany accounts payable	0.0	10.2
Short-term debt and current portion of long-term debt and capital lease obligations	11.4	14.7
Other current liabilities	35.3	27.9
Total current liabilities	114.8	116.9
Long-term debt and capital lease obligations	8.9	11.5
Intercompany loan payable	66.2	67.1
Other long-term liabilities	10.9	12.4
Total liabilities	200.8	207.9
Total shareholders' equity and noncontrolling interests	206.5	159.1
Total liabilities and shareholders' equity	$ 407.3	$ 367.0