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Segment Information - Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets    
Property, plant and equipment, net $ 240.4 $ 264.8
United States    
Revenues from External Customers and Long-Lived Assets    
Property, plant and equipment, net 86.4 112.4
China    
Revenues from External Customers and Long-Lived Assets    
Property, plant and equipment, net 32.1 31.8
Other countries    
Revenues from External Customers and Long-Lived Assets    
Property, plant and equipment, net $ 121.9 $ 120.6