FINANCIAL STATEMENT PRESENTATION (Details) - USD ($) $ in Millions	Mar. 01, 2017	Mar. 31, 2017	Feb. 28, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Extinguishment of debt	$ 1,110.0
Long-term debt	$ 236.0	$ 236.2
4.20% Building Loan
Debt Instrument [Line Items]
Interest rate		4.20%
Convertible Debt | 1.75% Senior Notes due 2017
Debt Instrument [Line Items]
Interest rate			1.75%	1.75%
Senior Notes | Second Lien Notes
Debt Instrument [Line Items]
Interest rate	7.50%
Long-term debt	$ 225.0
Senior Notes | 7 1⁄2% Senior Notes due 2022
Debt Instrument [Line Items]
Interest rate	7.50%	7.50%	7.50%	7.50%
Long-term debt		$ 225.0
Secured Debt | 4.20% Building Loan
Debt Instrument [Line Items]
Interest rate		4.20%
Long-term debt	$ 11.0	$ 11.2