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CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowances for doubtful accounts $ 5.1 $ 5.3
Preferred stock, par value $ 0.10 $ 0.10
Preferred stock, authorized 50,000,000 50,000,000
Preferred stock, issued 0 0
Common stock, par value $ 0.10 $ 0.10
Common stock, authorized 500,000,000 500,000,000
Common stock, issued 109,695,171 109,695,171
Common stock, oustanding 108,567,959 107,983,360
Treasury stock 1,127,212 1,711,811