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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Accounts receivable, allowance (in dollars) $ 0.0 $ 0.0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 245,000,000 245,000,000
Common stock, shares issued 69,768,128 69,340,985
Common stock, shares outstanding 43,436,076 42,965,856
Treasury stock, shares 26,332,052 26,375,129
Preferred stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Series A junior participating preferred stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 100,000 100,000
Preferred stock, shares issued 0 0