CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 38.2	$ 37.6
Common stock, par value
Common stock, shares authorized	180,000,000	180,000,000
Common stock, issued	92,314,092	92,302,299
Common stock, outstanding	92,293,823	92,285,408
Treasury stock, shares	20,269	16,891