WISCONSIN ECONOMIC DEVELOPMENT TAX CREDIT (Details) - Wisconsin Economic Development Tax Credit Agreement $ in Millions	3 Months Ended		9 Months Ended	21 Months Ended
	Sep. 30, 2016 USD ($)	Mar. 31, 2015 USD ($) item	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
Agreements
Refundable tax credits available, contingent on the Company expending $26.3 million in capital investments and establishing 758 full-time positions		$ 9.0
Capital investment expenditures over specified period, requirement to earn the refundable tax credits		$ 26.3
Full-time positions that must be created over a specified time period to earn the refundable tax credits | item		758
Period over which the capital investment expenditures must be incurred and the creation of full-time positions must be completed		7 years
Refundable tax credits earned				$ 4.0
Refundable tax credit received				0.2
Refundable tax credit receivable	$ 3.8		$ 3.8	3.8
Amortization of tax credits	0.2		0.5
Prepaid expenses and other current assets
Agreements
Refundable tax credit receivable	0.9		0.9	0.9
Other long-term assets
Agreements
Refundable tax credit receivable	2.9		2.9	2.9
Short-term other liabilities
Agreements
Refundable tax credit, offsetting liability	0.8		0.8	0.8
Other long-term liabilities
Agreements
Refundable tax credit, offsetting liability	$ 2.5		$ 2.5	$ 2.5