CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	3.0	3.0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized (in shares)	100.0	100.0
Common stock, shares issued (in shares)	70.4	68.8
Common stock, shares outstanding (in shares)	70.2	68.6
Treasury stock, at cost (in shares)	0.2	0.2