Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 12.3	$ 13.1
Property, plant and equipment, accumulated depreciation	938.7	886.2
Intangible assets, accumulated amortization	$ 35.4	$ 32.7
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	37,500,000	37,500,000
Common stock, shares issued	26,681,236	26,480,837
Common stock, shares outstanding	26,681,236	26,480,837