Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 51.8	$ 70.9
Accounts receivable, net	234.0	233.5
Inventories	307.2	290.1
Prepaid expenses and other current assets	40.8	87.2
Total current assets	633.8	681.7
Property, plant and equipment, net	1,425.6	1,238.2
Goodwill and other intangible assets	58.9	59.8
Investments in affiliated companies	30.4	34.2
Other assets	38.7	22.5
Total assets	2,187.4	2,036.4
Current liabilities:
Short-term borrowings and current maturities of long-term debt		1.3
Accounts payable	148.9	175.0
Accrued compensation and benefits	62.8	66.4
Other accrued liabilities	80.9	67.9
Total current liabilities	292.6	310.6
Long-term debt	576.5	415.0
Long-term retirement obligations	38.6	38.7
Other non-current liabilities	100.1	122.2
Total liabilities	$ 1,007.8	$ 886.5
Commitments and Contingencies (see Note 13)
Stockholders’ equity:
Common stock, $0.01 par value, 200.0 shares of stock authorized, 106.0 and 104.8 shares of stock issued at December 31, 2015 and 2014, respectively	$ 1.1	$ 1.0
Additional paid-in capital	715.8	678.5
Retained earnings	1,044.4	845.5
Accumulated other comprehensive loss	(123.9)	(69.7)
Total stockholders' equity including treasury stock value	1,637.4	1,455.3
Less: Treasury stock, at cost, 12.5 and 9.3 shares at December 31, 2015 and 2014, respectively	(457.8)	(305.4)
Total stockholders’ equity	1,179.6	1,149.9
Total liabilities and stockholders’ equity	$ 2,187.4	$ 2,036.4