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

SHAREHOLDERS' EQUITY (Accumulated Other Comprehensive Income (Loss)) (Details)

SHAREHOLDERS' EQUITY (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]	听	听
Beginning Balance	$ (444.1)	$ (1,330.5)
Ending Balance	(484.8)	(703.0)
Changes in Pension and Other Post-Retirement Benefits, net of tax [Member]	听	听
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]	听	听
Beginning Balance	(263.9)	(260.6)
Other comprehensive income (loss) before reclassifications	0.5	3.3
Net loss reclassified from accumulated other comprehensive income (loss)	6.2	6.4
Ending Balance	(257.2)	(250.9)
Unrealized Net Gain (Loss) on Foreign Currency Translation [Member]	听	听
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]	听	听
Beginning Balance	225.4	239.3
Other comprehensive income (loss) before reclassifications	0.7	(12.7)
Net loss reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Ending Balance	226.1	226.6
Net Unrealized Gain (Loss) on Derivative Financial Instruments, net of tax [Member]	听	听
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]	听	听
Beginning Balance	(0.5)	听
Other comprehensive income (loss) before reclassifications	0.4	听
Net loss reclassified from accumulated other comprehensive income (loss)	(0.1)	听
Ending Balance	(0.2)	听
Accumulated Other Comprehensive Income (Loss) [Member]	听	听
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]	听	听
Beginning Balance	(39.0)	(21.3)
Other comprehensive income (loss) before reclassifications	1.6	(9.4)
Net loss reclassified from accumulated other comprehensive income (loss)	6.1	6.4
Ending Balance	$ (31.3)	$ (24.3)