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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Acquisitions (Details) $ in Millions			3 Months Ended
Acquisitions (Details) $ in Millions	Nov. 30, 2016 USD ($)	Aug. 29, 2016 USD ($) facility	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Adjustment to increase (decrease) goodwill			$ (0.8)
Goodwill			737.1	$ 737.9
TimBar Corporation
Business Acquisition [Line Items]
Number of corrugated products production facilities acquired \| facility		6
Cash purchase price		$ 385.6
Debt instrument, face amount		$ 385.0
Debt instrument, term		5 years
Adjustment to increase (decrease) goodwill			(1.1)
Purchase price			384.5
Goodwill			156.2	157.3
Acquired finite-lived intangible assets, weighted average useful life		14 years 2 months 24 days
Intangible assets			94.4	94.4
Property, plant and equipment			95.3	95.3
Other net assets			38.6	$ 38.6
Columbus Container Inc
Business Acquisition [Line Items]
Cash purchase price	$ 99.7
Adjustment to increase (decrease) goodwill			$ 0.3
Goodwill	$ 36.9
Acquired finite-lived intangible assets, weighted average useful life	14 years 4 months 24 days
Intangible assets	$ 26.3
Property, plant and equipment	27.2
Other net assets	$ 9.3
Minimum \| TimBar Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life		2 years
Minimum \| Columbus Container Inc
Business Acquisition [Line Items]
Property, plant and equipment useful life	1 year
Maximum \| TimBar Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life		24 years
Maximum \| Columbus Container Inc
Business Acquisition [Line Items]
Property, plant and equipment useful life	32 years