Restructuring (Details) $ in Millions	3 Months Ended		10 Months Ended	12 Months Ended		23 Months Ended
	Mar. 31, 2018 USD ($)	Jun. 30, 2017	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2018 USD ($)
2016 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 Closed	4
Restructuring Charges	$ 0.8			$ 8.2	$ 21.6	$ 30.6
Restructuring and Related Cost, Expected Cost Remaining	1.1		$ 1.1			1.1
Restructuring Reserve Settled	(1.0)
Restructuring Reserve, Translation and Other Adjustment	(0.2)
Restructuring Reserve	5.1		5.1	5.5		5.1
Payments for Restructuring	1.0			15.4	8.3
Restructuring and Related Cost, Expected Cost	31.7		31.7			31.7
Expected Cash Payments for Plant Closure	$ 1.7
2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost Number of Planned Closure Facilities		4
Restructuring and Related Cost, Expected Number of Positions Eliminated		500
Restructuring and Related Cost Number of Facilities Closed	2
Restructuring Charges	$ 4.4		43.5	39.1
Restructuring and Related Cost, Expected Cost Remaining	22.1		22.1			22.1
Restructuring Reserve Settled	(6.2)
Restructuring Reserve, Translation and Other Adjustment	(0.1)
Restructuring Reserve	19.8		19.8	21.7		19.8
Payments for Restructuring	3.7			6.8
Restructuring and Related Cost, Expected Cost	65.6		65.6			65.6
Employee Related Costs [Member] | 2016 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	(0.1)
Restructuring Reserve Settled	(0.2)
Restructuring Reserve, Translation and Other Adjustment	(0.2)
Restructuring Reserve	0.6		0.6	1.1		0.6
Restructuring and Related Cost, Expected Cost	13.0		13.0			13.0
Employee Related Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	1.2
Restructuring Reserve Settled	(3.4)
Restructuring Reserve, Translation and Other Adjustment	(0.1)
Restructuring Reserve	16.9		16.9	19.2		16.9
Fixed Asset Related Expenses [Member] | 2016 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	2.0		2.0			2.0
Fixed Asset Related Expenses [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	2.5
Restructuring Reserve Settled	(2.5)
Restructuring Reserve, Translation and Other Adjustment	0.0
Restructuring Reserve	0.0		0.0	0.0		0.0
Other Costs [Member] | 2016 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.9
Restructuring Reserve Settled	(0.8)
Restructuring Reserve, Translation and Other Adjustment	0.0
Restructuring Reserve	4.5		4.5	4.4		4.5
Restructuring and Related Cost, Expected Cost	17.0		17.0			17.0
Other Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.7
Restructuring Reserve Settled	(0.3)
Restructuring Reserve, Translation and Other Adjustment	0.0
Restructuring Reserve	2.9		2.9	2.5		2.9
USPackaging [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	2.0		15.4	13.4
Restructuring and Related Cost, Expected Cost Remaining	16.6		16.6			16.6
Restructuring and Related Cost, Expected Cost	32.0		32.0			32.0
Latin America [Member] | 2016 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.9			8.0	20.5	29.4
Restructuring and Related Cost, Expected Cost Remaining	1.1		1.1			1.1
Restructuring and Related Cost, Expected Cost	30.5		30.5			30.5
Latin America [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	1.2		21.9	20.7
Restructuring and Related Cost, Expected Cost Remaining	4.8		4.8			4.8
Restructuring and Related Cost, Expected Cost	26.7		26.7			26.7
Rest of World [Member] | 2016 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	(0.1)			0.2	$ 1.1	1.2
Restructuring and Related Cost, Expected Cost Remaining	0.0		0.0			0.0
Restructuring and Related Cost, Expected Cost	1.2		1.2			1.2
Rest of World [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	1.1		2.6	1.5
Restructuring and Related Cost, Expected Cost Remaining	0.4		0.4			0.4
Restructuring and Related Cost, Expected Cost	3.0		3.0			3.0
Corporate Segment [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring Charges	0.1		3.6	$ 3.5
Restructuring and Related Cost, Expected Cost Remaining	0.3		0.3			0.3
Restructuring and Related Cost, Expected Cost	3.9		3.9			3.9
Minimum [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	65.0		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			29.0
Minimum [Member] | Fixed Asset Related Expenses [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	19.0		19.0			19.0
Minimum [Member] | Other Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	17.0		17.0			17.0
Maximum [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	70.0		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			31.0
Maximum [Member] | Fixed Asset Related Expenses [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	20.0		20.0			20.0
Maximum [Member] | Other Costs [Member] | 2017 Restructuring Program [Member]
Restructuring Reserve Disclosures [Line Items]
Restructuring and Related Cost, Expected Cost	$ 19.0		$ 19.0			$ 19.0