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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
CURRENT ASSETS:    
Allowance for doubtful accounts $ 102.1 $ 98.1
OTHER ASSETS:    
Accumulated amortization on intangible assets $ 277.7 $ 266.6
SHAREHOLDERS’ EQUITY:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized (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 (in shares) 125,000,000 125,000,000
Common stock, issued (in shares) 114,727,890 114,504,928
Treasury stock at cost (in shares) 43,059,996 41,466,590