XML 90 R69.htm IDEA: XBRL DOCUMENT v3.10.0.1
Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 25.2 $ 19.7 $ 15.1
Patents      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, net $ 26.2 $ 13.4  
Weighted average useful life (in years) 7 years 10 years