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WISCONSIN ECONOMIC DEVELOPMENT TAX CREDIT (Details) - Wisconsin Economic Development Tax Credit Agreement $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2015 USD ($) item
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	$ 7.8
Refundable tax credit received	2.4
Refundable tax credit receivable	5.4
Amortization of tax credits	0.4	$ 0.3
Prepaid expenses and other current assets
Agreements
Refundable tax credit receivable	1.9
Other long-term assets
Agreements
Refundable tax credit receivable	3.5
Short-term other liabilities
Agreements
Refundable tax credit, offsetting liability	1.9
Other long-term liabilities
Agreements
Refundable tax credit, offsetting liability	$ 3.2

X

- Definition

Represents the amortization of the tax credits, representing a reduction of operating expenses.

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- Definition

The amount of expenditures in capital investments the Company is required to make over a specified period to earn the refundable tax credits.

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- Definition

Represents the number of full-time positions that must be created over a specified time period to earn the refundable tax credits.

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- Definition

The period over which the capital investment expenditures must be incurred and the creation of full-time positions must be completed.

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- Definition

The amount of refundable tax credits earned, relating to capital investments and job creation, as of the end of the reporting period.

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The offsetting liability of the refundable tax credit receivable.

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The amount of refundable tax credit receivable as of the end of the reporting period.

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Amount of refundable tax credit received during the reporting period.

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- Definition

Represents the refundable tax credits available, that is contingent on the Company expending a specified dollar amount on capital investments and the creation of a specified number of full-time positions.

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