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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current Assets    
Allowance for doubtful accounts $ 108.6 $ 111.6
Other Assets    
Accumulated amortization on intangible assets $ 176.1 $ 138.1
Shareholders' Equity    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized shares (in shares) 25,000,000 25,000,000
Preferred stock, issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized shares (in shares) 125,000,000 125,000,000
Common stock, issued shares (in shares) 109,076,337 108,294,605
Treasury stock at cost, shares (in shares) 29,172,342 26,535,104