Fair Value Measurements Fair Value Inputs, Liabilities, Quantitative Information (Details)		12 Months Ended
	Feb. 03, 2017	Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Adjusted EBITDA Volatility	29.00%	30.00%	26.00%
Market price of risk	6.93%	5.24%	5.99%
Cost of debt	4.16%	5.25%	4.08%
Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.1000	0.0825	0.0875
Measurement Input, Risk Free Interest Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.0282	0.0287	0.0258