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Fair Value Measurements - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Sep. 28, 2018
Dec. 31, 2017
Fair Value, Inputs, Level 1    
Liabilities:    
Contingent consideration   $ 0.0
Fair Value, Inputs, Level 1 | Demand and time deposits    
Assets:    
Cash and cash equivalents $ 11.3 71.7
Fair Value, Inputs, Level 1 | Money market funds    
Assets:    
Cash and cash equivalents 0.3 0.2
Fair Value, Inputs, Level 2    
Liabilities:    
Contingent consideration   0.0
Fair Value, Inputs, Level 2 | Demand and time deposits    
Assets:    
Cash and cash equivalents 0.0 0.0
Fair Value, Inputs, Level 2 | Money market funds    
Assets:    
Cash and cash equivalents 0.0 0.0
Fair Value, Inputs, Level 3    
Liabilities:    
Contingent consideration   2.3
Fair Value, Inputs, Level 3 | Demand and time deposits    
Assets:    
Cash and cash equivalents 0.0 0.0
Fair Value, Inputs, Level 3 | Money market funds    
Assets:    
Cash and cash equivalents 0.0 0.0
Estimate of Fair Value    
Liabilities:    
Contingent consideration   2.3
Estimate of Fair Value | Demand and time deposits    
Assets:    
Cash and cash equivalents 11.3 71.7
Estimate of Fair Value | Money market funds    
Assets:    
Cash and cash equivalents $ 0.3 $ 0.2