Legal, Regulatory Matters and Contingencies (Details) $ in Millions			1 Months Ended		2 Months Ended	3 Months Ended	12 Months Ended
	Jan. 30, 2017 defendant	Apr. 16, 2013 a	Dec. 31, 2016 USD ($) lawsuit	Nov. 30, 2016 item	Jan. 31, 2017 lawsuit	Dec. 31, 2016 USD ($) customer	Jun. 30, 2016 lawsuit	Nov. 24, 2015 USD ($)
Richard Asherman
Contingencies
Severance compensation, period		18 months
Amount as a percentage of value of land that Mr. Asherman sought to have in the matter		50.00%
Area of land | a		1.66
Government Pricing
Contingencies
Number of government entity customers for whom the Company completed a contract compliance review | customer						1
Estimated liability for potential overcharges			$ 9.3			$ 9.3
Indemnification asset								$ 8.3
Private Antitrust and Consumer Protection Litigation
Contingencies
Number of lawsuits filed | lawsuit			4		3		22
Private Antitrust and Consumer Protection Litigation | Subsequent Events
Contingencies
Number of additional defendants | defendant	2
Shareholder Litigation
Contingencies
Number of officers | item				2