Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Reserves on trade accounts receivable	$ 12.6	$ 12.2
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50.0	50.0
Preferred stock, shares issued	0.0	0.0
Preferred stock, shares outstanding	0.0	0.0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750.0	750.0
Common stock, shares issued	131.4	131.4
Common stock, shares outstanding	131.4	131.4