OTHER COMPREHENSIVE LOSS - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Total accumulated other comprehensive loss	$ 10,152.7	$ 9,993.6	$ 2,869.1	$ 2,828.6
Foreign currency translation
Statement of Financial Position [Abstract]
Total accumulated other comprehensive loss	(260.2)	(308.6)	(202.2)
Derivative contracts
Statement of Financial Position [Abstract]
Total accumulated other comprehensive loss	2.4	(3.3)	(0.1)
AOCI including portion attributable to noncontrolling interest, tax	0.8	0.0
Pension and post retirement benefit plans
Statement of Financial Position [Abstract]
Total accumulated other comprehensive loss	(81.3)	(70.7)	(54.3)
AOCI including portion attributable to noncontrolling interest, tax	27.0	24.7
Accumulated Other Comprehensive Loss
Statement of Financial Position [Abstract]
Total accumulated other comprehensive loss	$ (339.1)	$ (382.6)	$ (256.6)	$ (45.0)