Discontinued Operations - Applied Utility Systems, Inc. (Details) - Applied Utility Systems, Inc. - USD ($) $ in Millions			1 Months Ended
	Jun. 03, 2015	Oct. 01, 2009	Oct. 31, 2015	Dec. 31, 2015	Jul. 21, 2014	Dec. 31, 2013
Sales And Use Tax Audit
Discontinued Operations
Sales tax owed				$ 0.9		$ 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
Discontinued Operations, Held-for-sale
Discontinued Operations
Settlement sought		$ 0.9
Settlement amount	$ 0.7
Settlement paid	$ 0.1