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Fair Value of Financial Instruments - Contingent Consideration (Details) - Contingent consideration - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Changes in contingent consideration liabilities    
Balance at the beginning of the period $ 12.7 $ 16.6
Current period additions 9.9 5.0
Current period adjustments (1.9) 2.3
Current period settlements (5.5) (11.7)
Foreign currency effect (0.1) 0.5
Balance at the end of the period $ 15.1 $ 12.7