Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details 5)	12 Months Ended
	Dec. 31, 2018
Goodwill and Other Intangible Assets
Finite-Lived Intangible Assets, Remaining Amortization Period	9 years 9 months
Customer-Related Intangible Assets
Goodwill and Other Intangible Assets
Finite-Lived Intangible Assets, Remaining Amortization Period	9 years 7 months 6 days
Technology and other intangibles
Goodwill and Other Intangible Assets
Finite-Lived Intangible Assets, Remaining Amortization Period	10 years 1 month 1 day