Statement of Consolidated Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ (292.2)us-gaap_NetIncomeLoss	$ 15.8us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant and equipment	7.6us-gaap_Depreciation	7.0us-gaap_Depreciation
Amortization of definite-lived intangible assets	0.4us-gaap_AmortizationOfIntangibleAssets	0.4us-gaap_AmortizationOfIntangibleAssets
Amortization of debt discount and debt issuance costs	3.2	2.9
Deferred income taxes – Note 4	(176.7)	8.7
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	(1.0)	(0.7)
Non-cash equity compensation	2.1us-gaap_ShareBasedCompensation	2.0us-gaap_ShareBasedCompensation
Non-cash unrealized losses (gains) on derivative instruments	4.5us-gaap_UnrealizedGainLossOnDerivatives	(2.9)us-gaap_UnrealizedGainLossOnDerivatives
Non-cash net periodic postretirement benefit charges (income) relating to VEBAs1	0.6	(5.6)
Non-cash Loss on Settlement of Union VEBA	446.7kalu_NoncashLossonSettlementofUnionVEBA	0kalu_NoncashLossonSettlementofUnionVEBA
Other non-cash changes in assets and liabilities	0.3us-gaap_OtherNoncashIncomeExpense	0.1us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Trade and other receivables	(18.3)	(2.2)
Inventories	(3.3)us-gaap_IncreaseDecreaseInInventories	11.3us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(2.4)	(2.3)
Accounts payable	0.4	10.4
Accrued liabilities	19.1	(1.4)
Annual variable cash contributions to VEBAs1	(13.7)	(16.0)
Long-term assets and liabilities, net	30.1	(0.4)
Net cash provided by operating activities	7.4	27.1
Cash flows from investing activities:
Capital expenditures	(11.3)	(15.4)
Proceeds from disposition of available for sale securities	84.0	25.0
Net cash provided by investing activities	72.7	9.6
Cash flows from financing activities:
Repayments of Capital Lease Obligations	(0.1)	0
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	1.0	0.7
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares	(2.5)	(2.2)
Repurchase of common stock	(28.2)	(12.7)
Cash dividend paid to stockholders	(7.1)us-gaap_PaymentsOfDividendsCommonStock	(6.4)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities	(36.9)	(20.6)
Net increase in cash and cash equivalents during the period	43.2	16.1
Cash and cash equivalents at beginning of period	177.7	169.5
Cash and cash equivalents at end of period	$ 220.9	$ 185.6

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