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Fair Value of Financial Instruments - Contingent Consideration (Details) - Contingent consideration - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in contingent consideration liabilities    
Balance at the beginning of the period $ 16.6 $ 4.6
Current period additions 5.0 5.1
Current period adjustments 2.3 6.9
Current period settlements (11.7)  
Foreign currency effect 0.5  
Balance at the end of the period 12.7 16.6
Amount of changes to the fair value of the contingent consideration recognized in earnings $ 2.3 $ 6.9