OTHER ASSETS (Narrative) (Details) In Millions, unless otherwise specified														12 Months Ended
	Dec. 31, 2014 1.00% Convertible Senior Notes Due March 2018	Dec. 31, 2013 1.00% Convertible Senior Notes Due March 2018	Mar. 31, 2012 1.00% Convertible Senior Notes Due March 2018 USD ($)	Dec. 31, 2014 1.25% Convertible Senior Notes Due March 2015	Dec. 31, 2013 1.25% Convertible Senior Notes Due March 2015	Mar. 31, 2010 1.25% Convertible Senior Notes Due March 2015 USD ($)	Dec. 31, 2014 0.35% Senior Convertible Notes Due June 2020	Dec. 31, 2013 0.35% Senior Convertible Notes Due June 2020	May 31, 2013 0.35% Senior Convertible Notes Due June 2020 USD ($)	Dec. 31, 2014 0.9% Senior Convertible Notes Due September 2021	Aug. 31, 2014 0.9% Senior Convertible Notes Due September 2021 USD ($)	Dec. 31, 2014 2.375% Senior Notes Due September 2024 EUR (€)	Sep. 30, 2014 2.375% Senior Notes Due September 2024 EUR (€)	Dec. 31, 2014 Convertible Debt Converted Debt USD ($)	Dec. 31, 2013 Convertible Debt Converted Debt USD ($)	Oct. 31, 2011 Revolving credit facility USD ($)
Debt Instrument
Debt Instrument, Face Amount			$ 1,000.0			$ 575.0			$ 1,000.0		$ 1,000.0	€ 1,000.0	€ 1,000.0			$ 1,000.0
Interest rate stated percentage (as a percent)	1.00%	1.00%	1.00%	1.25%	1.25%	1.25%	0.35%	0.35%	0.35%	0.90%	0.90%	2.375%	2.375%
Write off of Deferred Debt Issuance Cost														$ 0.5	$ 2.4