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Revenue (Tables)
3 Months Ended
Mar. 31, 2022
Revenue Recognition [Abstract]  
Disaggregation of Revenue [Table Text Block]
The following table presents our revenues disaggregated by geography, based on the billing addresses of our customers:
 Three Months Ended March 31,
20222021
 (In millions)
U.S.$224.6 $207.1 
EMEA58.6 56.4 
China25.1 25.4 
Other38.6 34.7 
Total revenues$346.9 $323.6