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Financial Instruments and Risk Management - General (Details)
$ / shares in Units, € in Millions, item in Millions, $ in Millions, £ in Billions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
EUR (€)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
EUR (€)
Mar. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
GBP (£)
item
approach
Jun. 30, 2016
USD ($)
item
approach
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
USD ($)
Financial Instruments and Risk Management                    
Long-term debt               $ 11,035.0   $ 5,028.0
Aggregate fair value of derivative instruments with credit-risk-related contingent features that were in a net liability position               125.0   69.0
Collateral amount posted for derivative instruments with credit-risk-related contingent features that were in a net liability position               5.0   5.0
4.375% Senior Notes, due December 2020                    
Financial Instruments and Risk Management                    
Long-term debt               $ 1,000.0   $ 1,000.0
Interest rate (as a percent)             4.375% 4.375% 4.375% 4.375%
Senior Notes, due 2020 and 2023                    
Financial Instruments and Risk Management                    
Long-term debt | €                 € 1,100  
3.50% Senior Notes, euro denominated, due December 2020                    
Financial Instruments and Risk Management                    
Long-term debt               $ 444.0 € 400 $ 435.0
Interest rate (as a percent)             3.50% 3.50% 3.50% 3.50%
4.375% Senior Notes, euro denominated, due December 2023                    
Financial Instruments and Risk Management                    
Long-term debt               $ 777.0 € 700 $ 760.0
Interest rate (as a percent)             4.375% 4.375% 4.375% 4.375%
Rexam                    
Financial Instruments and Risk Management                    
Restricted cash in escrow             £ 1.5 $ 1,900.0    
Commodity contracts                    
Financial Instruments and Risk Management                    
Number of methods through which entity manages commodity price risk in connection with market price fluctuations of aluminum ingot | approach             2 2    
Notional amount of derivatives               $ 708.0    
Period within which derivative will expire           3 years        
Impact on derivative contracts included in accumulated other comprehensive earnings (loss), net of tax               3.0    
Net gain (loss) expected to be recognized in the consolidated statement of earnings during the next 12 months           $ 3.0        
Commodity contracts | Derivatives Designated As Hedging Instruments | Cash Flow Hedging                    
Financial Instruments and Risk Management                    
Notional amount of derivatives               681.0    
Interest rate swap agreements | Rexam | Derivatives Not Designated As Hedging Instruments                    
Financial Instruments and Risk Management                    
Notional amount terminated     $ 200.0              
Interest rate swap agreements | Rexam | Derivatives Not Designated As Hedging Instruments                    
Financial Instruments and Risk Management                    
Notional amount terminated       € 850 $ 923.0          
Interest rate swap agreements | Registrant Excluding Effects Of Acquisition [Member]                    
Financial Instruments and Risk Management                    
Notional amount terminated $ 709.0                  
Interest rate swap agreements | Maximum                    
Financial Instruments and Risk Management                    
Impact on derivative contracts included in accumulated other comprehensive earnings (loss), net of tax               (1.0)    
Interest rate swaption | Rexam | Derivatives Not Designated As Hedging Instruments                    
Financial Instruments and Risk Management                    
Notional amount terminated | €   € 1,600                
Currency Exchange Rate Risk | Rexam                    
Financial Instruments and Risk Management                    
Notional amount of derivatives             £ 1.4 1,800.0    
Currency Exchange Rate Risk | Registrant Excluding Effects Of Acquisition [Member]                    
Financial Instruments and Risk Management                    
Notional amount of derivatives               1,200.0    
Net after-tax gain included in AOCI (4.0)                  
Net gain (loss) expected to be recognized in the consolidated statement of earnings during the next 12 months 1.0                  
Cross-currency swap                    
Financial Instruments and Risk Management                    
Notional amount terminated 1,000.0                  
Amount of hedge contract               $ 1,000.0    
Cross-currency swap | Rexam                    
Financial Instruments and Risk Management                    
Notional amount terminated $ 705.0                  
Equity contracts                    
Financial Instruments and Risk Management                    
Change in company's stock price (in dollars per share) | $ / shares           $ 1        
Notional value of the swap (in shares) | item             1 1    
Equity contracts | Maximum                    
Financial Instruments and Risk Management                    
Impact of change in the company's stock price on pretax earnings           $ 1.0