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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
CURRENT ASSETS:    
Allowance for doubtful accounts $ 100.7 $ 98.1
OTHER ASSETS:    
Accumulated amortization on intangible assets $ 285.3 $ 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) 114,747,700 114,504,928
Treasury stock at cost (in shares) 45,320,219 41,466,590