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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2014
Fair Value Disclosures [Abstract]  
Assumptions used in determining fair value of the Call Option
The Company determines the fair value of the Call Options using a binomial lattice valuation model. The inputs to the model at March 31, 2014 were as follows:
The Company’s stock price at March 31, 2014
$
71.42

Quarterly dividend yield (per share) upon purchase of the Call Option1
$
0.24

Risk-free interest rate2
0.13
%
Credit spread (basis points)3
154

Expected volatility rate4
17.0
%
______________________
1 
The quarterly dividend in the first quarter of 2014 was $0.35 per share, but the model assumes a discrete $0.24 per share quarterly dividend as was paid at the inception of the Call Options. Quarterly dividends in excess of $0.24 per share do not affect the Call Options’ value due to anti-dilution adjustments.
2 
The risk-free rate was based on the one-year Constant Maturity Treasury rate on March 31, 2014.
3 
The credit spread is based on the Company’s long-term credit rating of BB- issued by Standard & Poor’s and a senior unsecured credit rating of Ba3 issued by Moody’s.
4 
The volatility rate was based on both observed volatility, which is based on the Company’s historical stock price, and implied volatility from the Company’s traded options. Such volatility was further adjusted to take into consideration market participant risk tolerance.
Summary of assets and liabilities measured and recognized at fair value on a recurring basis
The following table presents the Company’s financial instruments, classified under the appropriate level of the fair value hierarchy, as of March 31, 2014:
 
Level 1
 
Level 2
 
Level 3
 
Total
FINANCIAL ASSETS:
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Aluminum -
 
 
 
 
 
 
 
Fixed priced purchase contracts
$
—

 
$
0.2

 
$
—

 
$
0.2

Fixed priced sales contracts
—

 
0.1

 
—

 
0.1

Midwest premium swap contracts
—

 
—

 
2.6

 
2.6

Natural Gas -
 
 
 
 
 
 
 
Fixed priced purchase contracts
—

 
1.1

 
—

 
1.1

Electricity -
 
 
 
 
 
 
 
Fixed priced purchase contracts
—

 
0.4

 
—

 
0.4

Hedges Relating to the Convertible Notes -
 
 
 
 
 
 
 
Call Options
—

 
83.9

 
—

 
83.9

 
 
 
 
 
 
 
 
All Other Financial Assets:
 
 
 
 
 
 
 
Cash and cash equivalents
68.5

 
117.1

 
—

 
185.6

Short-term investments
—

 
104.5

 
—

 
104.5

Deferred compensation plan asset
—

 
6.6

 
—

 
6.6

Total Assets
$
68.5

 
$
313.9

 
$
2.6

 
$
385.0

 
 
 
 
 
 
 
 
FINANCIAL LIABILITIES:
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Aluminum -
 
 
 
 
 
 
 
Fixed priced purchase contracts
$
—

 
$
(1.7
)
 
$
—

 
$
(1.7
)
Natural Gas -
 
 
 
 
 
 
 
Fixed priced purchase contracts
—

 
(0.5
)
 
—

 
(0.5
)
Electricity -
 
 
 
 
 
 
 
Fixed priced purchase contracts
—

 
(0.9
)
 
—

 
(0.9
)
Hedges Relating to the Convertible Notes -
 
 
 
 
 
 
 
Bifurcated Conversion Feature
—

 
(86.6
)
 
—

 
(86.6
)
 
 
 
 
 
 
 
 
All Other Financial Liabilities:
 
 
 
 
 
 
 
Senior Notes
(255.4
)
 
—

 
—

 
(255.4
)
Convertible Notes
(266.2
)
 
—

 
—

 
(266.2
)
Total Liabilities
$
(521.6
)
 
$
(89.7
)
 
$
—

 
$
(611.3
)






The following table presents the Company’s financial instruments, classified under the appropriate level of the fair value hierarchy, as of December 31, 2013:
 
Level 1
 
Level 2
 
Level 3
 
Total
FINANCIAL ASSETS:
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Aluminum -
 
 
 
 
 
 
 
Fixed priced purchase contracts
$
—

 
$
0.1

 
$
—

 
$
0.1

Midwest premium swap contracts
—

 
—

 
1.1

 
1.1

Natural Gas -
 
 
 
 
 
 
 
Fixed priced purchase contracts
—

 
0.5

 
—

 
0.5

Electricity -
 
 
 
 
 
 
 
Fixed priced purchase contracts
—

 
0.5

 
—

 
0.5

Foreign Currency -
 
 
 
 
 
 
 
Euro
—

 
0.1

 
—

 
0.1

Hedges Relating to the Convertible Notes -
 
 
 
 
 
 
 
Call Options
—

 
79.5

 
—

 
79.5

 
 
 
 
 
 
 
 
All Other Financial Assets:
 
 
 
 
 
 
 
Cash and cash equivalents
57.7

 
111.8

 
—

 
169.5

Short-term investments
—

 
129.5

 
—

 
129.5

Deferred compensation plan asset
—

 
6.5

 
—

 
6.5

Total Assets
$
57.7

 
$
328.5

 
$
1.1

 
$
387.3

 
 
 
 
 
 
 
 
FINANCIAL LIABILITIES:
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Aluminum -
 
 
 
 
 
 
 
Fixed priced purchase contracts
$
—

 
$
(1.8
)
 
$
—

 
$
(1.8
)
Natural Gas -
 
 
 
 
 
 
 
Fixed priced purchase contracts
—

 
(0.8
)
 
—

 
(0.8
)
Electricity -
 
 
 
 
 
 
 
Fixed priced purchase contracts
—

 
(0.4
)
 
—

 
(0.4
)
Hedges Relating to the Convertible Notes -
 
 
 
 
 
 
 
Bifurcated Conversion Feature
—

 
(83.1
)
 
—

 
(83.1
)
 
 
 
 
 
 
 
 
All Other Financial Liabilities:
 
 
 
 
 
 
 
Senior Notes
(255.4
)
 
—

 
—

 
(255.4
)
Convertible Notes
(260.0
)
 
—

 
—

 
(260.0
)
Total Liabilities
$
(515.4
)
 
$
(86.1
)
 
$
—

 
$
(601.5
)
Reconciliation of activity for financial instruments classified as Level 3
The following table presents a reconciliation of activity for the Midwest premium derivative contracts on a net basis:
 
Level 3
Balance at December 31, 2013
$
1.1

Total realized/unrealized gains included in:
 
Cost of goods sold excluding depreciation and amortization and other items and Unrealized losses (gains) on derivative instruments
1.8

Transactions involving Level 3 derivative contracts:
 
Purchases
0.4

Sales
—

Issuances
—

Settlements
(0.7
)
Transactions involving Level 3 derivatives — net
(0.3
)
Transfers in and (or) out of Level 3 valuation hierarchy
—

Balance at March 31, 2014
$
2.6

 
 
Total gains included in Unrealized losses (gains) on derivative instruments, attributable to the change in unrealized gains/losses relating to derivative contracts held at March 31, 2014:
$
2.1