Acquisitions (Details) - Zentri $ in Millions	Jan. 20, 2017 USD ($)
Acquisition
Purchase price of acquisition	$ 18.1
Cash consideration	14.3
Earn-Out, fair value	3.8
Potential maximum contingent consideration that could be paid	10.0
Purchase price allocation
Intangible assets	6.7
Goodwill tax deductible	12.5
Other net liabilities	$ 1.1