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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowances for doubtful accounts $ 6.5 $ 2.9
Inventory allowances $ 15.0 $ 13.6
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 29,554,500 29,554,500
Treasury stock, shares 5,058,972 5,120,799