Statement of Consolidated Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 15.8	$ 33.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant and equipment	7.0	6.6
Amortization of definite-lived intangible assets	0.4	0.4
Amortization of debt discount and debt issuance costs	2.9	2.7
Deferred income taxes	8.7	15.3
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	(0.7)	(0.8)
Non-cash equity compensation	2.0	2.6
Non-cash unrealized (gains) losses on derivative positions	(2.9)	0.3
Gain on disposition of available for sale securities	0	(0.5)
Non-cash net periodic pension benefit income relating to VEBAs	(5.6)	(5.6)
Other non-cash changes in assets and liabilities	0.1	(2.4)
Changes in operating assets and liabilities:
Trade and other receivables	(2.2)	(23.6)
Inventories	11.3	(13.3)
Prepaid expenses and other current assets	(2.3)	(2.3)
Accounts payable	10.4	9.9
Accrued liabilities	(1.4)	0.5
Annual variable cash contribution to VEBAs	(16.0)	(20.0)
Payable to affiliate	0	4.4
Long-term assets and liabilities, net	(0.4)	(1.4)
Net cash provided by operating activities	27.1	6.3
Cash flows from investing activities:
Capital expenditures	(15.4)	(9.3)
Purchase of available for sale securities	0	(85.6)
Proceeds from disposition of available for sale securities	25.0	85.2
Net cash provided by (used) in investing activities	9.6	(9.7)
Cash flows from financing activities:
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest	0.7	0.8
Cancellation of shares to cover employees’ tax withholdings upon vesting of non-vested shares	(2.2)	(2.2)
Repurchase of common stock	(12.7)	(14.7)
Cash dividend paid to stockholders	(6.4)	(5.9)
Net cash used in financing activities	(20.6)	(22.0)
Net increase (decrease) in cash and cash equivalents during the period	16.1	(25.4)
Cash and cash equivalents at beginning of period	169.5	273.4
Cash and cash equivalents at end of period	$ 185.6	$ 248.0