Supplemental Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2013

Supplemental Balance Sheet Information [Abstract]

Cash and Cash Equivalents

	June 30, 2013		December 31, 2012
Cash and Cash Equivalents.
Cash and money market funds	$	78.1	$	107.9
Commercial paper	203.6		165.5
Total	$	281.7	$	273.4

Trade Receivables

Trade Receivables.
Billed trade receivables	$	119.1		$	124.4
Unbilled trade receivables	4.4			0.2
Trade receivables, gross	123.5			124.6
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables, net	$	122.7		$	123.8

Inventories

Inventories.
Finished products	$	61.7	$	59.9
Work-in-process	69.1		55.5
Raw materials	54.5		53.9
Operating supplies and repair and maintenance parts	17.6		16.7
Total	$	202.9	$	186.0

Prepaid Expenses and Other Current Assets

Prepaid Expenses and Other Current Assets.
Current derivative assets – Notes 9 and 10	$	1.2	$	3.0
Current deferred tax assets	59.5		59.5
Current portion of option premiums paid – Notes 9 and 10	0.1		0.1
Short-term restricted cash	1.3		1.3
Prepaid taxes	4.0		2.1
Prepaid expenses	4.0		4.1
Total	$	70.1	$	70.1

Property, Plant and Equipment - Net

Property, Plant and Equipment - Net.
Land and improvements	$	22.6		$	22.6
Buildings and leasehold improvements	51.8			50.9
Machinery and equipment	406.5			400.4
Construction in progress	41.1			20.8
Active property, plant and equipment, gross	522.0			494.7
Accumulated depreciation	(124.7		)	(111.4		)
Active property, plant and equipment, net	397.3			383.3
Idled equipment	1.0			1.0
Total	$	398.3		$	384.3

Other Assets

Other Assets.
Derivative assets – Notes 9 and 10	$	52.5	$	55.5
Restricted cash	9.3		10.0
Long-term income tax receivable	—		2.9
Deferred financing costs	10.3		11.7
Available for sale securities	6.0		5.6
Other	0.4		0.3
Total	$	78.5	$	86.0

Other Accrued Liabilities

Other Accrued Liabilities.
Current derivative liabilities – Notes 9 and 10	$	6.0	$	3.1
Current portion of option premiums received – Notes 9 and 10	0.1		0.1
Uncleared cash disbursement	11.8		4.7
Accrued income taxes and taxes payable	5.7		3.1
Accrued annual VEBA contribution	—		20.0
Short-term environmental accrual – Note 8	4.6		3.0
Accrued interest	3.7		3.7
Short-term deferred revenue	3.2		6.7
Other	4.8		7.4
Total	$	39.9	$	51.8

Long-term Liabilities

Long-term Liabilities.
Derivative liabilities – Notes 9 and 10	$	61.2	$	63.5
Income tax liabilities	11.7		15.1
Workers’ compensation accruals	23.2		24.0
Long-term environmental accrual – Note 8	17.1		18.7
Long-term asset retirement obligations	4.0		3.8
Deferred compensation liability	6.3		5.8
Long-term capital lease	0.2		0.2
Other long-term liabilities	3.3		3.4
Total	$	127.0	$	134.5

Long-term Debt

Long-term Debt. — Note 3
Senior notes	$	225.0	$	225.0
Cash convertible senior notes	159.3		155.3
Total	$	384.3	$	380.3