Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2011

Supplemental Balance Sheet Information [Abstract]

Trade Receivables

	December 31, 2011			December 31, 2010
Trade Receivables.
Billed trade receivables	$	98.9		$	82.5
Unbilled trade receivables — Note 1	0.9			1.1
Trade receivables, gross	99.8			83.6
Allowance for doubtful receivables	(0.9		)	(0.6		)
Trade receivables, net	$	98.9		$	83.0

Inventories

Inventories.
Finished products	$	75.9	$	53.8
Work in process	57.5		49.6
Raw materials	58.1		50.9
Operating supplies and repairs and maintenance parts	14.2		13.2
Total	$	205.7	$	167.5

Prepaid Expenses and Other Current Assets

Prepaid Expenses and Other Current Assets.
Current derivative assets — Notes 12 and 13	$	—	$	22.1
Current deferred tax assets	63.0		46.8
Current portion of option premiums paid - Notes 12 and 13	0.4		5.6
Short-term restricted cash	7.8		0.9
Prepaid taxes	3.8		1.3
Prepaid expenses	3.9		3.4
Total	$	78.9	$	80.1

Property, Plant and Equipment

Property, Plant and Equipment.
Land and land improvements	$	22.6		$	23.3
Buildings and leasehold improvements	45.9			43.5
Machinery and equipment	356.7			338.0
Construction in progress	24.1			7.7
Active property, plant and equipment, gross	449.3			412.5
Accumulated depreciation	(86.9		)	(63.9		)
Active property, plant, and equipment, net	362.4			348.6
Idled equipment	5.4			5.5
Property, plant, and equipment, net	$	367.8		$	354.1

Other Assets

Other Assets.
Derivative assets — Notes 12 and 13	$	46.2	$	50.8
Option premiums paid — Notes 12 and 13	0.1		0.6
Restricted cash	10.4		16.3
Long-term income tax receivable	2.8		2.9
Deferred financing costs	7.8		7.7
Available for sale securities	4.9		4.6
Other	0.1		0.1
Total	$	72.3	$	83.0

Other Accrued Liabilities

Other Accrued Liabilities.
Current derivative liabilities — Notes 12 and 13	$	14.8	$	8.9
Current portion of option premiums received — Notes 12 and 13	0.1		7.0
Current portion of income tax liabilities	—		1.1
Accrued income taxes and taxes payable	2.6		1.8
Accrued annual VEBA contribution	—		2.1
Accrued freight	2.4		1.9
Short-term environmental accrual — Note 11	1.2		1.1
Accrued interest	2.3		2.1
Short-term deferred revenue — Note 1	13.5		10.8
Other	4.1		5.2
Total	$	41.0	$	42.0

Long-term Liabilities

Long-term Liabilities.
Derivative liabilities — Notes 12 and 13	$	55.5	$	62.2
Option premiums received — Notes 12 and 13	0.1		0.3
Income tax liabilities	13.4		12.9
Workers’ compensation accruals	20.8		15.9
Long-term environmental accrual — Note 11	20.8		19.1
Long-term asset retirement obligations	3.8		3.8
Long-term deferred revenue - Note 1	3.3		13.2
Deferred compensation liability	5.1		4.9
Other long-term liabilities	3.2		2.4
Total	$	126.0	$	134.7