Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Property, plant and equipment, net accumulated depreciation	$ 368.2	$ 280.5
Intangible assets, net accumulated amortization	$ 13.2	$ 10.4
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	37,500,000	37,500,000
Common stock, shares issued	26,215,302	26,197,142
Common stock, shares outstanding	26,215,302	26,197,142