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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Goodwill, Gross      
Balance, beginning of period $ 221.7    
Purchase accounting adjustments 9.5    
Foreign currency fluctuations (1.9)    
Balance, end of period 229.3   $ 221.7
Accumulated Impairment Losses      
Balance, beginning of period (39.0)    
Foreign currency fluctuations (0.6)    
Balance, end of period (39.6)   (39.0)
Goodwill, Net      
Balance, beginning of period 182.7    
Purchase accounting adjustments 9.5    
Foreign currency fluctuations (2.5)    
Balance, end of period 189.7   182.7
Acquired Finite-lived Intangible Assets      
Original cost 205.3   191.0
Accumulated amortization (49.3)   (44.5)
Carrying value 156.0   146.5
Purchase of Intangible Assets 0.2 $ 1.0  
Amortization expense 5.7 $ 5.9  
Estimated aggregate amortization expense of Intangible Assets      
Remaining 2019 16.4    
2020 20.7    
2021 19.2    
2022 17.1    
2023 15.5    
Thereafter 67.1    
Total 156.0    
Gaomei      
Acquired Finite-lived Intangible Assets      
Purchase of Intangible Assets 17.4    
Customer Lists      
Acquired Finite-lived Intangible Assets      
Original cost 156.3   143.0
Accumulated amortization (37.4)   (33.7)
Carrying value $ 118.9   $ 109.3
Weighted-average original life (in years) 14 years   15 years
Trade Names      
Acquired Finite-lived Intangible Assets      
Original cost $ 31.9   $ 30.6
Accumulated amortization (6.0)   (5.3)
Carrying value $ 25.9   $ 25.3
Weighted-average original life (in years) 11 years   10 years
Technology      
Acquired Finite-lived Intangible Assets      
Original cost $ 17.1   $ 17.4
Accumulated amortization (5.9)   (5.5)
Carrying value $ 11.2   $ 11.9
Weighted-average original life (in years) 11 years   10 years