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CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Millions
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2021
€ / shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
€ / shares
CONSOLIDATED BALANCE SHEETS        
Accumulated depreciation | $ $ 35.9   $ 35.2  
Ordinary shares, par value (in euros per share) | € / shares   € 0.05   € 0.05
Ordinary shares, authorized 80,000,000   60,000,000  
Ordinary shares, issued 46,207,776   44,777,799  
Ordinary shares, outstanding 46,207,776   44,777,799