Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 55.4	$ 63.1
Preferred Stock, Par Value	$ 0.00	$ 0.00
Preferred Stock, Shares Authorized	20,000,000	20,000,000
Preferred Stock, Shares Issued	200,000	200,000
Preferred Stock, Shares Outstanding	200,000	200,000
Common Stock, Par Value	$ 0.10	$ 0.10
Common Stock, Shares Authorized	800,000,000	800,000,000
Common Stock, Shares, Issued	491,400,000	489,500,000
Common Stock, Shares, Outstanding	449,500,000	489,100,000
Treasury Stock, Shares	41,900,000	400,000