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

FAIR VALUE MEASUREMENTS (Narrative) (Details)

FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative assets	$ 93.6	$ 51.0	$ 39.4
Derivative Liability	$ 4.4	听	2.7
Management Estimate of 62% Fe	62.00%	听	听
Impairment Charges, CIP	$ 2.6	听	听
Fair Value, Inputs, Level 1 [Member]	听	听	听
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative assets	0.0	听	0.0
Derivative Liability	0.0	听	0.0
Fair Value, Inputs, Level 2 [Member]	听	听	听
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative assets	0.0	听	0.0
Derivative Liability	0.2	听	0.3
Fair Value, Inputs, Level 3 [Member]	听	听	听
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative assets	93.6	听	39.4
Derivative Liability	4.2	听	2.4
Not Designated as Hedging Instrument [Member]	听	听	听
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative assets	93.6	听	39.4
Derivative Liability	4.2	听	2.4
Derivative Financial Instruments, Assets [Member] \| Not Designated as Hedging Instrument [Member] \| Customer Supply Agreement [Member]	听	听	听
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative assets	91.2	听	37.9
Derivative Financial Instruments, Assets [Member] \| Not Designated as Hedging Instrument [Member] \| Provisional Pricing Arrangements [Member]	听	听	听
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative assets	2.4	听	1.5
Other Current Liabilities [Member] \| Not Designated as Hedging Instrument [Member] \| Customer Supply Agreement [Member] \| Fair Value, Inputs, Level 3 [Member]	听	听	听
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative Liability	0.0	听	0.0
Other Current Liabilities [Member] \| Not Designated as Hedging Instrument [Member] \| Provisional Pricing Arrangements [Member]	听	听	听
Fair Value, Assets And Liabilities Components [Line Items]	听	听	听
Derivative Liability	$ 4.2	听	$ 2.4