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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event In May 2018, the Company acquired OPTIS, a premier provider of software for scientific simulation of light, human vision and physics-based visualization, for a purchase price of approximately $300 million in cash. The acquisition will extend the Company's portfolio into the area of optical simulation to further its solutions for autonomous vehicles. The acquisition met the definition of a business under ASU 2017-01.