Discontinued Operations, Divestitures and Acquisitions - Divestitures (Details) € in Millions, BRL in Millions, $ in Millions				3 Months Ended								12 Months Ended
	Nov. 01, 2015 EUR (€)	Nov. 01, 2015 USD ($)	Apr. 02, 2015 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 BRL	Dec. 31, 2017 USD ($)	Aug. 01, 2017 BRL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of business													$ 0.0	$ (1.8)	$ 13.4
Net sales				$ 1,227.8	$ 1,131.3	$ 1,070.3	$ 1,032.2	$ 1,101.4	$ 1,065.1	$ 1,038.9	$ 1,005.9		4,461.6	4,211.3	4,410.3
Earnings before income tax provision													393.3	387.9	291.4
Polystyrene Food Tray Business | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross purchase price | BRL																BRL 7.2		BRL 24.0
Assets held for sale																	$ 3.1
Liabilities held for sale																	$ 2.2
North American Foam Trays And Absorbent Pads
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses			$ 75.6
Transaction costs													7.2	7.0
Additional transaction costs													0.2
Purchase price adjustments			$ 5.9
North American Foam Trays And Absorbent Pads | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of business													26.3	26.5
Net sales														52.9
Earnings before income tax provision														10.3
European Food Trays
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses	€ 17.6	$ 19.0										€ 16.5	$ 17.7
Purchase price adjustments	€ 1.7	$ 1.9
Net sales														48.7
Earnings before income tax provision														6.9
European Food Trays | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of business														$ (1.6)	$ (13.1)