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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	$ 6,311.2		$ 6,311.2	$ 6,010.3
Less accumulated depreciation	(3,386.3)		(3,386.3)	(3,114.6)
Property, plant and equipment, net	$ 2,924.9		2,924.9	2,895.7
Depreciation [Abstract]
Depreciation expense			347.8	324.1	$ 323.0
Incremental depreciation			$ 10.5	2.9	$ 9.0
Wallula, Washington Mill
Depreciation [Abstract]
High-performance of virgin kraft linerboard machine percentage	100.00%	100.00%	100.00%
Land and Land Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	$ 156.0		$ 156.0	149.7
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	729.8		729.8	717.1
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	5,162.5		5,162.5	4,951.4
Construction in Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	194.5		194.5	125.4
Other
Property Plant And Equipment [Line Items]
Property, plant and equipment, at cost	$ 68.4		$ 68.4	$ 66.7

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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