ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of accumulated other comprehensive income
Balance at the beginning of the period	$ (132.8)	$ (119.4)	$ (279.6)
Foreign currency translation adjustment	(716.2)	(50.8)	161.0
Unrealized gain on equity method investment, net of tax	51.3	0	0
Reclassification to net income (loss)	(51.3)	0	0
Net unrealized holding gain on available-for-sale equity securities, net of tax	1.8	3.6	0.4
Reclassification to net income (loss)	(1.8)	(4.0)	(1.4)
Pension adjustment	(66.9)	37.8	0.2
Balance at the end of the period	(915.9)	(132.8)	(119.4)
Foreign Currency Translation Adjustment
Components of accumulated other comprehensive income
Balance at the beginning of the period	(170.3)	(119.5)	(280.5)
Foreign currency translation adjustment	(716.2)	(50.8)	161.0
Balance at the end of the period	(886.5)	(170.3)	(119.5)
Net Unrealized Holding Gain (Loss) on Securities | Auction rate securities
Components of accumulated other comprehensive income
Balance at the beginning of the period	0			0
Unrealized gain on equity method investment, net of tax	51.3
Reclassification to net income (loss)	(51.3)
Balance at the end of the period	0		0	0
Net Unrealized Holding Gain (Loss) on Securities | Available-for-sale equity securities
Components of accumulated other comprehensive income
Balance at the beginning of the period	0	0.4	1.6
Net unrealized holding gain on available-for-sale equity securities, net of tax	1.8	3.6	0.4
Reclassification to net income (loss)	(1.8)	(4.0)	(1.6)
Balance at the end of the period	0	0	0.4
Net Unrealized Holding Gain (Loss) on Securities | Available-for-sale debt securities
Components of accumulated other comprehensive income
Balance at the beginning of the period			(0.2)
Reclassification to net income (loss)			0.2
Balance at the end of the period	0	0	0
Pension Adjustment
Components of accumulated other comprehensive income
Balance at the beginning of the period	37.5	(0.3)	(0.5)
Pension adjustment	(66.9)	37.8	0.2
Balance at the end of the period	$ (29.4)	$ 37.5	$ (0.3)