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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
CURRENT ASSETS:    
Allowance for doubtful accounts $ 105.6 $ 111.4
OTHER ASSETS:    
Accumulated amortization on intangible assets $ 250.2 $ 276.2
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) 113,748,811 112,876,552
Treasury stock at cost (in shares) 36,839,662 34,762,316