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Fair Value of Financial Instruments - Changes in Level 3 Liabilities (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Mestrelab Research, S.L  
Fair value of financial instruments  
Remaining ownership percentage under options that can be exercised after 2022 49.00%
Contingent consideration  
Changes in contingent consideration liabilities  
Balance at the beginning of the period $ 15.1
Current period additions 4.4
Current period adjustments 1.9
Current period settlements (5.1)
Foreign currency effect (0.1)
Balance at the end of the period 16.2
Hybrid instrument  
Changes in contingent consideration liabilities  
Balance at the beginning of the period 12.9
Current period adjustments 0.8
Balance at the end of the period $ 13.7