Restructuring Plans (Details) $ in Millions	3 Months Ended		12 Months Ended		22 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2019 USD ($)
Restructuring Reserve Disclosures [Line Items]
Restructuring and acquisition-related costs	$ 6.9	$ 13.4
2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost Number of Planned Closure Facilities		4
Restructuring and Related Cost Number of Facilities Ceasing Operations	3
Restructuring and Related Cost, Expected Number of Positions Eliminated		500
Restructuring and Related Cost Number of Facilities Closed	4
Restructuring Charges	$ 1.3		$ 19.3	$ 39.1	$ 59.7
Restructuring and Related Cost, Expected Cost Remaining	10.2				10.2
Restructuring Reserve Settled	(2.3)
Restructuring Reserve, Translation and Other Adjustment	0.0
Restructuring Reserve	9.9		10.9		9.9
Payments for Restructuring	2.3		17.4	6.8
Restructuring and Related Cost, Expected Cost	69.9				69.9
Employee Related Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.2
Restructuring Reserve Settled	(1.3)
Restructuring Reserve, Translation and Other Adjustment	0.0
Restructuring Reserve	5.8		6.9		5.8
Fixed Asset Related Expenses [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.1
Restructuring Reserve Settled	(0.1)
Restructuring Reserve, Translation and Other Adjustment	0.0
Restructuring Reserve	0.0		0.0		0.0
Other Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	1.0
Restructuring Reserve Settled	(0.9)
Restructuring Reserve, Translation and Other Adjustment	0.0
Restructuring Reserve	4.1		4.0		4.1
USPackaging [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.3		9.6	13.4	23.3
Restructuring and Related Cost, Expected Cost Remaining	6.4				6.4
Restructuring and Related Cost, Expected Cost	29.7				29.7
Latin America [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.7		7.3	20.7	28.7
Restructuring and Related Cost, Expected Cost Remaining	3.6				3.6
Restructuring and Related Cost, Expected Cost	32.3				32.3
Rest of World [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.2		1.9	1.5	3.6
Restructuring and Related Cost, Expected Cost Remaining	0.2				0.2
Restructuring and Related Cost, Expected Cost	3.8				3.8
Corporate Segment [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.1		$ 0.5	$ 3.5	4.1
Restructuring and Related Cost, Expected Cost Remaining	0.0				0.0
Restructuring and Related Cost, Expected Cost	4.1				4.1
Minimum [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	65.0				65.0
Minimum [Member] | Employee Related Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	29.0				29.0
Minimum [Member] | Fixed Asset Related Expenses [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	22.0				22.0
Minimum [Member] | Other Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	14.0				14.0
Maximum [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	70.0				70.0
Maximum [Member] | Employee Related Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	31.0				31.0
Maximum [Member] | Fixed Asset Related Expenses [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	24.0				24.0
Maximum [Member] | Other Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	$ 15.0				$ 15.0