Discontinued Operations - Applied Utility Systems, Inc. (Details) - Applied Utility Systems, Inc. - Sales And Use Tax Audit - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2015	Mar. 31, 2017	Dec. 31, 2016	Jul. 21, 2014	Dec. 31, 2013
Discontinued Operations
Loss Contingency Accrual		$ 0.1	$ 0.1
Sales tax owed				$ 1.5
Basis for determining sales tax owed				12.2
Adjusted basis for determining sales tax owed				9.0
Amount offered to settle the case	$ 0.1
Maximum
Discontinued Operations
Sales tax owed				$ 0.9	$ 1.5