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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
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 70,499,819 70,207,581
Common stock, shares outstanding 43,880,603 43,588,365
Treasury stock, shares 26,619,216 26,619,216
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