星空传媒 Inc. Quarterly report pursuant to Section 13 or 15(d)

PROPERTY, PLANT AND EQUIPMENT (Value Of Each Of The Major Classes Of Consolidated Depreciable Assets) (Details)

PROPERTY, PLANT AND EQUIPMENT (Value Of Each Of The Major Classes Of Consolidated Depreciable Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	$ 2,071.3	听	$ 2,000.7
Allowance for depreciation and depletion	(990.0)	听	(966.9)
Property, plant and equipment, net	1,081.3	$ 1,033.8	1,033.8
Land rights and mineral rights	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	549.6	听	549.6
Office and information technology	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	65.1	听	65.8
Buildings	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	84.0	听	85.2
Mining equipment	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	531.2	听	533.9
Processing equipment	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	616.0	听	610.9
Electric power facilities	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	56.9	听	56.9
Land improvements	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	24.2	听	23.7
Asset retirement obligation	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	16.9	听	16.9
Other	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	25.2	听	25.2
Construction in-progress	听	听	听
Property, Plant and Equipment [Line Items]	听	听	听
Property, plant and equipment, gross	$ 102.2	听	$ 32.6