Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 43.8	$ 65.5
Accounts receivable, net	281.5	232.4
Inventories	288.4	265.3
Prepaid expenses and other current assets	80.1	93.2
Total current assets	693.8	656.4
Property, plant and equipment	1,767.1	1,661.2
Less accumulated depreciation	(627.2)	(593.8)
Property, plant and equipment, net	1,139.9	1,067.4
Goodwill and intangible assets	61.1	61.0
Investments in affiliated companies	23.2	23.3
Other assets	29.4	28.0
Total assets	1,947.4	1,836.1
Current liabilities:
Short-term borrowings	2.8	3.0
Accounts payable	128.0	135.9
Accrued liabilities	136.8	129.8
Total current liabilities	267.6	268.7
Long-term debt	395.0	292.0
Other non-current liabilities	128.6	115.0
Total liabilities	791.2	675.7
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 104.7 and104.0 shares issued at June 30, 2014 and December 31, 2013, respectively	1.0	1.0
Additional paid-in capital	671.3	642.3
Retained earnings	736.8	636.1
Accumulated other comprehensive income	9.2	10.7
Total stockholders' equity including treasury stock value	1,418.3	1,290.1
Less - Treasury stock, at cost, 8.2 shares at June 30, 2014 and 5.1 shares at December 31, 2013	(262.1)	(129.7)
Total stockholders' equity	1,156.2	1,160.4
Total liabilities and stockholders' equity	$ 1,947.4	$ 1,836.1