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Fair Value of Financial Instruments - Contingent Consideration and Hybrid Instrument Liability (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Mestrelab    
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 Beginning $ 15.8 $ 15.1
Current period additions (1.2) (5.4)
Current period adjustments (4.4) 2.3
Current period settlements (8.7) (6.7)
Foreign currency effect 0.4 (0.3)
Balance at End 4.3 15.8
Hybrid instrument    
Changes in contingent consideration liabilities    
Balance at Beginning 10.6 12.9
Current period additions (2.6) (2.3)
Foreign currency effect 0.7  
Balance at End $ 13.9 $ 10.6