Statement of Consolidated Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net loss	$ (249.9)	$ 56.2
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation of property, plant and equipment	23.0	21.9
Amortization of definite-lived intangible assets	1.2	1.2
Amortization of debt discount and debt issuance costs	4.2	8.8
Deferred income taxes – Note 4	(151.0)	29.6
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	(1.1)	(0.8)
Non-cash equity compensation	7.0	5.4
Non-cash unrealized losses (gains) on derivative instruments	7.7	(3.6)
Non-cash impairment charges	0.0	1.5
Losses on disposition of property, plant and equipment	(0.2)	(0.1)
Non-cash net periodic postretirement benefit cost (income) relating to VEBAs1	1.8	(17.7)
Non-cash loss on removal of Union VEBA net assets1	446.7	0.0
Other non-cash changes in assets and liabilities	0.4	0.5
Changes in operating assets and liabilities:
Trade and other receivables	4.2	(9.6)
Inventories	(2.6)	3.1
Prepaid expenses and other current assets	0.0	(0.9)
Accounts payable	(15.0)	28.7
Accrued liabilities1	19.7	(2.8)
Annual variable cash contributions to VEBAs1	(13.7)	(16.0)
Long-term assets and liabilities, net1	26.1	(1.9)
Net cash provided by operating activities	108.9	103.7
Cash flows from investing activities:
Capital expenditures	(38.4)	(39.6)
Purchase of available for sale securities	(0.5)	(53.4)
Proceeds from disposition of available for sale securities	84.0	82.2
Change in restricted cash	0.0	(0.7)
Net cash provided by (used in) investing activities	45.1	(11.5)
Cash flows from financing activities:
Repurchase of Senior Notes2	(6.1)	0.0
Settlement of Convertible Notes2	(175.0)	0.0
Proceeds from cash-settled call options related to settlement of Convertible Notes2	94.9	0.0
Payment for conversion premium related to settlement of Convertible Notes2	(94.9)	0.0
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	1.1	0.8
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares	(3.0)	(2.4)
Repurchase of common stock	(45.1)	(28.7)
Cash dividend paid to stockholders	(21.0)	(19.1)
Net cash used in financing activities	(249.1)	(49.4)
Net (decrease) increase in cash and cash equivalents during the period	(95.1)	42.8
Cash and cash equivalents at beginning of period	177.7	169.5
Cash and cash equivalents at end of period	$ 82.6	$ 212.3