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Segment Information - Revenue by Geographic Location (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Document Fiscal Year Focus                 2018    
Revenues $ 223.8 $ 236.2 $ 188.4 $ 178.5 $ 215.5 $ 196.0 $ 164.4 $ 168.3 $ 826.9 $ 744.2 $ 755.7
Long-lived assets 211.7       183.0       211.7 183.0  
Asia                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 605.4 560.8 578.7
Long-lived assets 160.9       144.9       160.9 144.9  
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 126.6 101.3 93.3
Long-lived assets 49.8       37.2       49.8 37.2  
Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 85.8 72.3 75.1
Long-lived assets 0.9       0.9       0.9 0.9  
Other Americas                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 3.6 4.4 3.1
Long-lived assets 0.1       0.0       0.1 0.0  
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 5.5 5.4 $ 5.5
Long-lived assets $ 0.0       $ 0.0       $ 0.0 $ 0.0