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Financial Instruments and Risk Management - General (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) item approach | Jun. 30, 2017 USD ($) item approach $ / shares | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) item approach | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Financial Instruments and Risk Management |  |  |  |  |  |
Costs associated with terminated interest rate contracts |  |  | $ 4.0 |  | $ 20.0 |
Aggregate fair value of derivative instruments with credit-risk-related contingent features that were in a net liability position | $ 24.0 | $ 24.0 |  | $ 24.0 |  | $ 44.0
Collateral amount posted for derivative instruments with credit-risk-related contingent features that were in a net liability position | $ 0.0 | $ 0.0 |  | $ 0.0 |  | $ 0.0
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 |  | 2 |  |
Notional amount of derivatives | $ 985.0 | $ 985.0 |  | $ 985.0 |  |
Gain (loss) on derivatives included in accumulated other comprehensive earnings (loss), net of tax | 23.0 | 23.0 |  | 23.0 |  |
Net gain expected to be recognized in the consolidated statement of earnings during the next 12 months |  |  |  | 17.0 |  |
Commodity contracts | Derivatives Designated As Hedging Instruments | Cash Flow Hedging |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Notional amount of derivatives | $ 922.0 | $ 922.0 |  | 922.0 |  |
Commodity contracts | Maximum |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Period within which derivative will expire |  | 3 years |  |  |  |
Interest rate swap agreements | Cash Flow Hedging |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Net after-tax gain (loss) included in AOCI |  |  |  | $ 0.0 |  |
Number of contracts outstanding | item | 0 | 0 |  | 0 |  |
Currency Exchange Rate Risk |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Notional amount of derivatives | $ 2,000.0 | $ 2,000.0 |  | $ 2,000.0 |  |
Period within which derivative will expire |  |  |  | 2 years |  |
Net gain expected to be recognized in the consolidated statement of earnings during the next 12 months |  |  |  | $ 5.0 |  |
Net after-tax gain (loss) included in AOCI | 5.0 |  |  |  |  |
Cross-currency swap |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Gain (loss) on derivatives included in accumulated other comprehensive earnings (loss), net of tax | (13.0) | (13.0) |  | (13.0) |  |
Amount of hedge contract |  |  | $ 1,000.0 |  | $ 1,000.0 |
Fair value of swaps | $ (39.0) | $ (39.0) |  | $ (39.0) |  |
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 | 2,700,000 | 2,700,000 |  | 2,700,000 |  |
Fair value of swaps | $ 3.4 | $ 3.4 |  | $ 3.4 |  |

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