SEGMENT AND GEOGRAPHIC AREA INFORMATION - Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,843.2	$ 2,137.0	$ 1,824.4
Long-lived assets	7,060.0	7,405.8
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	852.8	704.6	283.8
Long-lived assets	3,199.5	3,522.7
Saudi Arabia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	363.9	408.7	443.9
Long-lived assets	818.4	896.8
Norway [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	312.6	403.6	213.4
Long-lived assets	813.7	1,330.0
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	120.6	163.0	288.2
Long-lived assets	1,229.9	827.5
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	193.3	457.1	$ 595.1
Long-lived assets	$ 998.5	$ 828.8