Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts receivable, allowances	$ 71.9	$ 79.7
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5.0	5.0
Preferred stock, shares issued
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300	300
Common stock, shares issued	139.0	139.0
Treasury stock, shares	26.4	21.7