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Derivative Financial Instruments and Related Hedging Programs (Tables)
 12 Months Ended
Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of realized and unrealized gains and losses
Realized and unrealized (losses) gains associated with all derivative contracts consisted of the following for each period presented:
 
 
Year Ended December 31,
 
 
2014
 
2013
 
2012
Realized gains (losses):
 
 
 
 
 
 
Aluminum
 
$
6.9

 
$
(5.5
)
 
$
(9.0
)
Natural Gas
 
1.0

 
(1.8
)
 
(6.7
)
Electricity
 
(0.1
)
 
0.8

 
(3.4
)
Total realized gains (losses):
 
$
7.8

 
$
(6.5
)
 
$
(19.1
)
Unrealized (losses) gains:
 
 
 
 
 
 
Hedges of operational risk:
 
 
 
 
 
 
Aluminum
 
$
(2.6
)
 
$
(3.1
)
 
$
10.1

Natural Gas
 
(6.0
)
 
2.6

 
4.3

Electricity
 
(1.8
)
 
1.1

 
0.8

Foreign Currency
 
—

 
0.1

 
—

Total hedges of operational risk
 
(10.4
)
 
0.7

 
15.2

Option Assets relating to the Convertible Notes
 
5.2

 
24.2

 
9.0

Bifurcated Conversion Feature of the Convertible Notes
 
(1.6
)
 
(21.0
)
 
(8.2
)
Total unrealized (losses) gains
 
$
(6.8
)
 
$
3.9

 
$
16.0
Summary of material derivative positions
The following table summarizes the Company's material derivative positions at December 31, 2014:
Aluminum
 
Maturity Period
(month/year)
 
Notional Amount of Contracts (mmlbs)
Fixed price purchase contracts
 
1/15 through 1/16
 
67.3

Midwest premium swap contracts1
 
1/15 through 12/15
 
67.1

Natural Gas2
 
Maturity Period
(month/year)
 
Notional Amount of Contracts (mmbtu)
Fixed price purchase contracts
 
1/15 through 12/17
 
6,720,000

Electricity3
 
Maturity Period
(month/year)
 
Notional Amount of Contracts (Mwh)
Fixed price purchase contracts
 
1/15 through 12/15
 
175,200

Hedges Relating to the Convertible Notes
 
Contract Period
(month/year)
 
Notional Amount of Contracts (Common Shares)
Bifurcated Conversion Feature4
 
3/10 through 4/15
 
3,660,738

Option Assets4
 
3/10 through 4/15
 
3,660,738

_________________________
1 
Regional premiums represent the premium over the London Metal Exchange price for primary aluminum which is incurred on the Company's purchases of primary aluminum.
2 
As of December 31, 2014, the Company had Henry Hub NYMEX-based hedge positions in place to cover exposure to fluctuations in prices for approximately 81%, 73% and 12% of the expected natural gas purchases for 2015, 2016 and 2017, respectively.
3 
As of December 31, 2014, the Company had Mid-C International Commodity Exchange-based hedge positions in place to cover exposure to fluctuations in prices for approximately 44% of the expected electricity purchases for 2015.
4 
The Bifurcated Conversion Feature represents the cash conversion feature of the Convertible Notes. The Option Assets expire on the maturity or earlier conversion of the Convertible Notes and have an exercise price equal to the conversion price of the Convertible Notes, subject to anti-dilution adjustments substantially similar to the anti-dilution adjustments for the Convertible Notes. Although the fair value of the Option Assets is derived from a notional number of shares of the Company's common stock, the Option Assets may only be settled in cash.
Schedule of Offsetting Derivative Instruments by Counterparty [Table Text Block]
The Company enters into derivative contracts with counterparties, some of which are subject to enforceable master netting arrangements and some of which are not. The Company reflects the fair value of its derivative contracts on a gross basis on the Consolidated Balance Sheets (see Note 2).
The following tables present offsetting information regarding the Company's derivatives by type of counterparty as of December 31, 2014:
Derivative Assets and Collateral Held by Counterparty
 
 
 
 
 
 
 
Gross Amounts Not Offset in the Consolidated Balance Sheets
 
 
 
Gross Amounts of Recognized Assets
 
Gross Amounts Offset in the Consolidated Balance Sheets
 
Net Amounts of Assets Presented in the Consolidated Balance Sheets
 
Financial Instruments
 
Cash Collateral Received
 
Net Amount
Counterparty (with netting agreements)
$
0.9

 
$
—

 
$
0.9

 
$
0.8

 
$
—

 
$
0.1

Counterparty (without netting agreements)1
84.8

 
—

 
84.8

 
—

 
—

 
84.8

Total
$
85.7

 
$
—

 
$
85.7

 
$
0.8

 
$
—

 
$
84.9

Derivative Liabilities and Collateral Held by Counterparty
 
 
 
 
 
 
 
Gross Amounts Not Offset in the Consolidated Balance Sheets
 
 
 
Gross Amounts of Recognized Liabilities
 
Gross Amounts Offset in the Consolidated Balance Sheets
 
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets
 
Financial Instruments
 
Cash Collateral Pledged
 
Net Amount
Counterparty (with netting agreements)
$
(8.0
)
 
$
—

 
$
(8.0
)
 
$
(0.8
)
 
$
—

 
$
(7.2
)
Counterparty (without netting agreements)1
(85.0
)
 
—

 
(85.0
)
 
—

 
—

 
(85.0
)
Counterparty (with partial netting agreements)
(3.8
)
 
—

 
(3.8
)
 
—

 
—

 
(3.8
)
Total
$
(96.8
)
 
$
—

 
$
(96.8
)
 
$
(0.8
)
 
$
—

 
$
(96.0
)
_________________
1 
Such amounts include the fair value of the Bifurcated Conversion Feature and Option Assets at December 31, 2014 (see Note 11).

The following tables present offsetting information regarding the Company’s derivatives by type of counterparty as of December 31, 2013:
Derivative Assets and Collateral Held by Counterparty
 
 
 
 
 
 
 
Gross Amounts Not Offset in the Consolidated Balance Sheets
 
 
 
Gross Amounts of Recognized Assets
 
Gross Amounts Offset in the Consolidated Balance Sheets
 
Net Amounts of Assets Presented in the Consolidated Balance Sheets
 
Financial Instruments
 
Cash Collateral Received
 
Net Amount
Counterparty (with netting agreements)
$
1.0

 
$
—

 
$
1.0

 
$
0.8

 
$
—

 
$
0.2

Counterparty (without netting agreements)1
80.4

 
—

 
80.4

 
—

 
—

 
80.4

Counterparty (with partial netting agreements)
0.4

 
—

 
0.4

 
0.4

 
—

 
—

Total
$
81.8

 
$
—

 
$
81.8

 
$
1.2

 
$
—

 
$
80.6

Derivative Liabilities and Collateral Held by Counterparty
 
 
 
 
 
 
 
Gross Amounts Not Offset in the Consolidated Balance Sheets
 
 
 
Gross Amounts of Recognized Liabilities
 
Gross Amounts Offset in the Consolidated Balance Sheets
 
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets
 
Financial Instruments
 
Cash Collateral Pledged
 
Net Amount
Counterparty (with netting agreements)
$
(1.6
)
 
$
—

 
$
(1.6
)
 
$
(0.8
)
 
$
—

 
$
(0.8
)
Counterparty (without netting agreements)1
(83.2
)
 
—

 
(83.2
)
 
—

 
—

 
(83.2
)
Counterparty (with partial netting agreements)
(1.3
)
 
—

 
(1.3
)
 
(0.4
)
 
—

 
(0.9
)
Total
$
(86.1
)
 
$
—

 
$
(86.1
)
 
$
(1.2
)
 
$
—

 
$
(84.9
)
_________________
1 
Such amounts include the fair value of the Bifurcated Conversion Feature and Option Assets at December 31, 2013 (see Note 11).