Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 83.9	$ 64.7
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	150,000,000
Common stock, shares issued	92,700,000	92,700,000
Treasury stock, shares	1,800,000	900,000