Supplemental Balance Sheet Information

12 Months Ended

Dec. 31, 2014

Supplemental Balance Sheet Information [Abstract]

Supplemental Balance Sheet Information

Supplemental Balance Sheet Information

	December 31, 2014		December 31, 2013
Cash and Cash Equivalents
Cash and money market funds	$	29.5	$	57.7
Commercial paper	148.2		111.8
Total	$	177.7	$	169.5

Trade Receivables - Net
Billed trade receivables	$	128.7		$	120.2
Unbilled trade receivables — Note 1	1.4			0.4
Trade receivables, gross	130.1			120.6
Allowance for doubtful receivables	(0.8		)	(0.8		)
Trade receivables - net	$	129.3		$	119.8

Inventories
Finished products	$	73.6	$	72.5
Work-in-process	66.7		75.9
Raw materials	54.2		47.2
Operating supplies and repair and maintenance parts	20.2		18.8
Total	$	214.7	$	214.4

	December 31, 2014		December 31, 2013
Prepaid Expenses and Other Current Assets
Current derivative assets — Notes 10 and 11	$	85.7	$	2.0
Current deferred tax assets	86.4		36.7
Short-term restricted cash	0.3		0.3
Other	6.2		5.2
Total	$	178.6	$	44.2

Property, Plant and Equipment - Net
Land and improvements	$	22.9		$	22.6
Buildings and leasehold improvements	63.8			53.0
Machinery and equipment	509.8			425.6
Construction in progress	25.2			66.0
Property, plant and equipment - gross	621.7			567.2
Accumulated depreciation	(166.8		)	(137.9		)
Property, plant and equipment - net	$	454.9		$	429.3

Other Assets
Derivative assets — Notes 10 and 11	$	—	$	79.8
Restricted cash	10.0		9.3
Deferred financing costs	5.9		8.9
Deferred compensation plan assets	7.3		6.5
Other	0.1		0.3
Total	$	23.3	$	104.8

Other Accrued Liabilities
Current derivative liabilities — Notes 10 and 11	$	94.9	$	1.8
Uncleared cash disbursements	9.1		9.6
Accrued income taxes and taxes payable	5.2		4.3
Accrued annual VEBA contribution	13.7		16.0
Short-term environmental accrual — Note 9	2.3		2.8
Accrued interest	3.7		3.7
Short-term deferred revenue — Note 1	0.2		—
Other	3.7		6.6
Total	$	132.8	$	44.8

	December 31, 2014		December 31, 2013
Long-Term Liabilities
Derivative liabilities — Notes 10 and 11	$	1.9	$	84.3
Income tax liabilities	2.4		5.0
Workers’ compensation accruals	21.5		23.3
Long-term environmental accrual — Note 9	17.0		20.0
Long-term asset retirement obligations	4.4		4.0
Long-term deferred revenue - Note 1	0.5		—
Deferred compensation liability	7.2		7.0
Long-term capital leases	0.1		0.1
Other long-term liabilities	3.3		2.7
Total	$	58.3	$	146.4

Long-Term Debt — Note 3
Senior notes	$	225.0	$	225.0
Cash convertible senior notes	—		163.5
Total	$	225.0	$	388.5