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Acquisitions - Others (Details) € in Millions, $ in Millions, £ in Billions				1 Months Ended								2 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2016 GBP (£) shares	Jun. 30, 2016 USD ($) shares	Feb. 19, 2015 USD ($)	Sep. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 GBP (£) shares	Jun. 30, 2016 EUR (€) shares	Jun. 30, 2016 USD ($) shares	Mar. 31, 2016 USD ($)	Jan. 31, 2016 USD ($)	Feb. 28, 2015 USD ($)	Nov. 30, 2015 USD ($) shares	Mar. 31, 2016 EUR (€) item	Mar. 31, 2016 USD ($) item	Sep. 30, 2016 USD ($) item	Sep. 30, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)
Acquisitions
Long-term debt				$ 7,803.0											$ 7,803.0			$ 5,028.0
Purchase price, net of cash acquired															3,379.0	$ 29.0
Interest rate swap agreements
Acquisitions
Notional amount of derivatives				750.0											$ 750.0
Interest rate swap agreements \| Derivatives Designated As Hedging Instruments
Acquisitions
Number of contracts designated as hedges \| item															0
Cross-currency swap
Acquisitions
Notional amount terminated		$ 1,000.0
Ball Corporation
Acquisitions
Purchase price, net of cash acquired															$ (2,303.0)
Rexam \| Interest rate swap agreements \| Derivatives Not Designated As Hedging Instruments
Acquisitions
Notional amount terminated								$ 200.0
Rexam \| Interest rate swaption \| Derivatives Not Designated As Hedging Instruments
Acquisitions
Notional amount terminated \| €							€ 1,600
Latapack-Ball Embalagens Ltda. (Latapack-Ball)
Acquisitions
Treasury stock exchanged (in shares) \| shares												5,700,000
Consideration transferred												$ 17.4
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	£ 2.9	3,800.0
Rexam \| Currency exchange option and collar \| Derivatives Not Designated As Hedging Instruments
Acquisitions
Notional amount terminated						£ 1.4		$ 1,800.0
Rexam \| Interest rate swap agreements \| Derivatives Not Designated As Hedging Instruments
Acquisitions
Notional amount terminated													€ 850	$ 923.0
Rexam \| Interest rate swap agreements \| Derivatives Designated As Hedging Instruments
Acquisitions
Number of contracts designated as hedges \| item													0	0
Rexam \| Cross-currency swap \| Derivatives Not Designated As Hedging Instruments
Acquisitions
Notional amount terminated		$ 705.0
Rexam \| Ball Corporation
Acquisitions
Treasury stock exchanged (in shares) \| shares	32,250,000	32,250,000				32,250,000	32,250,000	32,250,000
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				$ 25.0
Revolving credit facilities
Acquisitions
Face amount of debt											1,000.0
Senior Notes 4.375 Percent Due 2020
Acquisitions
Long-term debt																		$ 1,000.0
Interest rate (as a percent)																	4.375%	4.375%
Senior Notes 4.375 Percent Due 2020 \| Senior Notes
Acquisitions
Long-term debt																		$ 1,000.0
Senior Notes 3.5 Percent Due 2020
Acquisitions
Long-term debt \| €																	€ 400
Interest rate (as a percent)																	3.50%	3.50%
Senior Notes 4.375 Percent Due 2023
Acquisitions
Long-term debt \| €																	€ 700
Interest rate (as a percent)																	4.375%	4.375%
5.25% Senior Notes, due June 2025
Acquisitions
Long-term debt																			$ 1,000.0
Interest rate (as a percent)																			5.25%
Multi-currency usd revolver, due March 2021 at variable rate \| Revolving credit facilities
Acquisitions
Maximum borrowing capacity of revolving credit facility									$ 1,500.0					$ 1,500.0
Term C Loan
Acquisitions
Repayment of debt obligation			$ 93.0								$ 93.0
Term A Loan, due March 2021
Acquisitions
Maturity term									5 years
Term A Loan, due March 2021 \| Rexam
Acquisitions
Proceeds released from restricted cash escrow accounts					$ 3,800.0
Term A Loan, due March 2021 \| Revolving credit facilities
Acquisitions
Face amount of debt									$ 1,400.0					$ 1,400.0
Maturity term									5 years