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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current assets:      
Allowance for doubtful accounts receivable $ 0.2 $ 1.6 $ 0.8
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01  
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000  
Preferred stock, shares issued (in shares) 0 0  
Common stock, par value (in dollars per share) $ 0.01 $ 0.01  
Common stock, shares authorized (in shares) 400,000,000 400,000,000  
Common stock, shares issued (in shares) 95,112,778 92,689,912  
Common Stock, Shares, Outstanding 91,894,980 91,611,549  
Treasury Stock, Shares 3,217,798 1,078,363