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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 23.3 $ 22.2
Preferred stock, Authorized shares 5,000,000 5,000,000
Preferred stock, issued shares 0 0
Preferred stock, outstanding shares 0 0
Common stock, Authorized shares 100,000,000 100,000,000
Common stock, Issued shares 75,122,110 75,007,694
Common stock, outstanding shares 75,122,110 75,007,694