Fair Value Measurement (Qualitative Information About Assets Measured at Fair Value on Recurring Basis Using Level 3 Inputs) (Details) - Recurring Basis - Contingent Consideration Receivable - Income approach (probability weighted discounted cash flow) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets	$ 9.8
Assumed market participant discount rate	7.40%
Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability weightings applied to different sales scenarios (in percent)	10.00%
Future forecast consideration receivable based on contractual terms with purchaser	$ 0.0
Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability weightings applied to different sales scenarios (in percent)	90.00%
Future forecast consideration receivable based on contractual terms with purchaser	$ 20.7