Acquisitions - Others (Details) shares in Thousands, £ in Millions, $ in Millions	1 Months Ended					2 Months Ended	6 Months Ended		12 Months Ended
	Oct. 31, 2016 USD ($)	Jun. 30, 2016 GBP (£)	Jun. 30, 2016 USD ($) item shares	Jan. 31, 2016 USD ($)	Feb. 28, 2015 USD ($)	Nov. 30, 2015 USD ($) shares	Jun. 30, 2016 GBP (£)	Jun. 30, 2016 USD ($) item shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jul. 31, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 29, 2015 USD ($)	Feb. 19, 2015 GBP (£)	Feb. 18, 2015 USD ($)
Acquisitions
Long-term debt									$ 7,389.0					$ 5,028.0
Maximum borrowing capacity of revolving credit facility									1,500.0									$ 1,000.0
Notional amount terminated | £		£ 1,400
Purchase price, net of cash acquired									3,379.0	$ 29.0
Interest rate swap agreements
Acquisitions
Notional amount of derivatives									500.0
Cross-currency swap
Acquisitions
Notional amount of derivatives			$ 1,000.0					$ 1,000.0
Notional amount terminated			1,000.0
Ball Corporation
Acquisitions
Purchase price, net of cash acquired									$ (2,303.0)
Latapack-Ball Embalagens Ltda. (Latapack-Ball)
Acquisitions
Treasury stock exchanged (in shares) | shares						5,700
Consideration transferred						$ 17.0
Wavefront
Acquisitions
Purchase price, net of cash acquired				$ 36.0
Sonoco
Acquisitions
Business acquired in cash					$ 29.0
Contingent cash consideration					11.0
Contingent noncash consideration					$ 24.0
Rexam
Acquisitions
Purchase price, net of cash acquired							£ 2,900	$ 3,800.0
Rexam | Currency exchange option and collar | Derivatives Not Designated As Hedging Instruments
Acquisitions
Notional amount terminated		£ 1,400	$ 1,800.0
Rexam | Interest rate swap agreements | Derivatives Designated As Hedging Instruments
Acquisitions
Number of hedge contracts | item			0					0
Rexam | Ball Corporation
Acquisitions
Treasury stock exchanged (in shares) | shares			32,250					32,250
Food And Aerosol Specialty Tin Business | Baltimore Maryland | Operating Segments
Disposal of business facility
Gain (loss) on dispositions	$ 9.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Food And Aerosol Specialty Tin Business | Baltimore Maryland
Disposal of business facility
Price agreed upon for sale of specialty tin manufacturing facility	$ 24.0
Senior Notes 4.375 Percent Due December 2020
Acquisitions
Long-term debt														$ 1,000.0
Interest rate (as a percent)									4.375%			4.375%	4.375%	4.375%
Face amount of debt														$ 1,000.0
Senior Notes 3.50 Percent Due December 2020
Acquisitions
Long-term debt | €												€ 400,000,000
Interest rate (as a percent)									3.50%			3.50%	3.50%	3.50%
Face amount of debt | €												€ 400,000,000
Senior Notes 4.375 Percent Due December 2023
Acquisitions
Long-term debt | €												€ 700,000,000
Interest rate (as a percent)									4.375%			4.375%	4.375%	4.375%
Face amount of debt | €												€ 700,000,000
Senior Notes 5.25 Percent Due June 2025
Acquisitions
Face amount of debt															$ 1,000.0
Term A Loan USD denominated Due June 2021 (2016 - 2.52%) | Rexam
Acquisitions
Face amount of debt											$ 1,400.0
Bridge Facility
Acquisitions
Face amount of debt | £													£ 1,900				£ 3,300
2018 Revolver
Acquisitions
Maximum borrowing capacity of revolving credit facility															$ 2,250.0	$ 3,000.0